{"id":220194,"date":"2025-03-06T23:56:22","date_gmt":"2025-03-06T23:56:22","guid":{"rendered":"https:\/\/www.solinst.com\/fluorescein-sensors\/"},"modified":"2026-05-07T21:15:49","modified_gmt":"2026-05-07T21:15:49","slug":"fluorescein-sensors","status":"publish","type":"page","link":"https:\/\/www.solinst.com\/en-gb\/products\/solinst-eureka\/water-quality-sensors\/fluorescein-sensors\/","title":{"rendered":"Fluorescein Sensors"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; fullwidth=&#8221;on&#8221; disabled_on=&#8221;on|on|on&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; disabled=&#8221;on&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_fullwidth_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/03\/5001-easy-probe-water-quality-sonde-1920&#215;500-1.webp&#8221; alt=&#8221;solinst eureka easyprobe water quality sondes&#8221; title_text=&#8221;Solinst Eureka EasyProbe Water Quality Sondes&#8221; src_tablet=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/03\/5001-easy-probe-water-quality-sonde-965&#215;500-1.webp&#8221; src_phone=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/03\/5001-easy-probe-water-quality-sonde-965&#215;500-1.webp&#8221; src_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_fullwidth_image][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;H1 and breadcrumbs&#8221; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;792ca5bd-0808-46bd-9ce7-3bcb8e74f4d3&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;4b28f470-0d73-4e9d-b92d-e6f41f2cea24&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;3078f328-b50a-467d-9906-3143dabcd7ac&#8221; header_text_align_tablet=&#8221;&#8221; header_text_align_phone=&#8221;&#8221; header_text_align_last_edited=&#8221;on|desktop&#8221; header_font_size_tablet=&#8221;30px&#8221; header_font_size_phone=&#8221;26px&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1 role=\"heading\" aria-level=\"2\" data-uw-rm-heading=\"level\">Fluorescein Sensors: Water Quality Monitoring<\/h1>\n<p>[\/et_pb_text][dsm_breadcrumbs disabled_on=&#8221;on|off|off&#8221; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; home_icon_text_color=&#8221;#d6d6d6&#8243; global_colors_info=&#8221;{}&#8221;][\/dsm_breadcrumbs][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Mobile-Only Nav with Offset&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;4759a92f-4b27-4854-bb2c-299854634e93&#8243; sticky_offset_top=&#8221;127px&#8221; global_module=&#8221;45704&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; width=&#8221;90%&#8221; custom_margin=&#8221;0px||||false|false&#8221; custom_padding=&#8221;0px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_code admin_label=&#8221;Eureka Mobile Nav &#8211; Select Dropdown&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_css_free_form=&#8221;select {||||      font-size: 1em; \/* Adjust font size *\/||      padding: 10px;   \/* Optional: Increase padding for better spacing *\/||      width: 100%;||      box-sizing: border-box;\/* Optional: Adjust width to fit the container *\/||      height: 50px;||}||||    \/* Style for dropdown options (fallback if needed) *\/||select option {||      font-size: 1.2em; \/* Ensures option text matches select styling *\/||      width: 100%;||    }&#8221; global_colors_info=&#8221;{}&#8221;]<select name=\"dropdown\" onchange=\"location = this.value;\"><!-- [et_pb_line_break_holder] --><option value=\"\">Solinst Eureka Menu<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/\">Solinst Eureka Main Page<\/option><!-- [et_pb_line_break_holder] -->    <!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/\">Water Quality Sondes<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/manta-plus-multi-parameter-probes\/\">-Manta Multiparameter Probes<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/manta-plus-multi-parameter-probes\/manta-plus-20-multiparameter-probes\/\">&#8211;Manta Plus 20<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/manta-plus-multi-parameter-probes\/manta-plus-25-multiparameter-probes\/\">&#8211;Manta Plus 25<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/manta-plus-multi-parameter-probes\/manta-plus-30-multiparameter-probe\/\">&#8211;Manta Plus 30<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/manta-plus-multi-parameter-probes\/manta-plus-35-multiparameter-probes\/\">&#8211;Manta Plus 35<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/manta-plus-multi-parameter-probes\/manta-f35-multiparameter-water-quality-probes\/\">&#8211;Manta F35<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/manta-plus-multi-parameter-probes\/manta-plus-40-multiparameter-probe\/\">&#8211;Manta Plus 40<\/option><!-- [et_pb_line_break_holder] -->\t<!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/trimeter\/\">-Trimeter<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/trimeter\/5001-trimeter-sonde-quote-form\/\">&#8211;Get a Quote<\/option><!-- [et_pb_line_break_holder] -->\t<!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/easy-probe\/\">-EasyProbe Water Quality Sonde<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/easy-probe\/5001-easyprobe-sondes-quote-form\/\">&#8211;Get a Quote<\/option><!-- [et_pb_line_break_holder] -->        <!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/\">Water Quality Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/temperature-sensor\/\">-Temperature Sensor<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/ph-sensors\/\">-pH Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/orp-oxidation-reduction-potential-sensors\/\">-ORP Sensor<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/turbidity-sensors\/\">-Turbidity Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/dissolved-oxygen-sensors\/\">-Dissolved Oxygen Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/conductivity-sensors\/\">-Conductivity Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/pressure-sensors\/\">-Pressure Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/total-dissolved-gas-sensors\/\">-Total Dissolved Gas Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/c02-carbon-dioxide-sensors\/\">-CO2 Carbon Dioxide Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/par-photosynthetically-active-radiation-sensors\/\">-PAR Photosynthetic Active Radiation Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/fluorometers\/\">-Fluorometers<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/chlorophyll-sensors\/\">&#8211;Chlorophyll Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/blue-green-algae-sensors\/\">&#8211;Blue Green Algae Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/cdom-colored-dissolved-organic-matter-sensors\/\">&#8211;CDOM Coloured Dissolved Organic Matter Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/optical-brightener-sensors\/\">&#8211;Optical Brightener Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/tryptophan-sensors\/\">&#8211;Tryptophan Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/rhodamine-sensors\/\">&#8211;Rhodamine Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/flourescein-sensors\/\">&#8211;Fluorescein Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/ptsa-fluorescence-sensors\/\">&#8211;PTSA Fluorescence Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/refined-oil-and-fuel-sensors\/\">&#8211;Refined Oil and Fuel Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/crude-oil-sensors\/\">&#8211;Crude Oil Sensors<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sensors\/ise-ion-selective-electrodes\/\">-ISE Ion Selective Electrodes<\/option><!-- [et_pb_line_break_holder] -->    <!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/rugged-field-devices-and-apps-for-water-quality-data-collection\/\">Rugged Field Devices and Apps<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/rugged-field-devices-and-apps-for-water-quality-data-collection\/manta-mobile-wireless-data-device\/\">-mantaMobile<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/rugged-field-devices-and-apps-for-water-quality-data-collection\/manta-link-app\/\">-MantaLink<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/rugged-field-devices-and-apps-for-water-quality-data-collection\/ruggedized-tablets-for-water-quality-monitoring\/\">-Ruggedised Tablets<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/rugged-field-devices-and-apps-for-water-quality-data-collection\/ruggedized-tablets-for-water-quality-monitoring\/samsung-galaxy-tab-active3\/\">&#8211;Samsung Galaxy Tab Active3<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/rugged-field-devices-and-apps-for-water-quality-data-collection\/ruggedized-tablets-for-water-quality-monitoring\/juniper-systems-mesa3\/\">&#8211;Juniper Systems MESA3<\/option><!-- [et_pb_line_break_holder] --><option value=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/rugged-field-devices-and-apps-for-water-quality-data-collection\/ruggedized-tablets-for-water-quality-monitoring\/ipad-mini-ruggedized-tablet\/\">&#8211;iPad Mini Ruggedised Tablet<\/option><!-- [et_pb_line_break_holder] --><option 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button_link=&#8221;https:\/\/www.solinst.com\/instruments\/solinst-eureka\/?utm_source=solinst&amp;utm_medium=WC-global-sidebar-position1&amp;utm_campaign=5001&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;RGBA(255,255,255,0)&#8221; background_enable_color=&#8221;on&#8221; background_image=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/02\/solinst-eureka-water-quality-probes-1.webp&#8221; background_enable_image=&#8221;on&#8221; background_size=&#8221;contain&#8221; background_position=&#8221;top_center&#8221; custom_button=&#8221;on&#8221; button_bg_color=&#8221;#f58025&#8243; button_border_width=&#8221;2px&#8221; button_border_radius=&#8221;20px&#8221; button_font=&#8221;|600|||||||&#8221; global_colors_info=&#8221;{}&#8221; sticky_transition=&#8221;on&#8221;]<\/p>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<h2><strong><\/strong><\/h2>\n<p><strong><\/strong><\/p>\n<p><strong><\/strong><\/p>\n<p><strong><\/strong><\/p>\n<p><strong><\/strong><\/p>\n<p><strong><\/strong><\/p>\n<h2><strong>Water Quality Probes<\/strong><\/h2>\n<p>Solinst Eureka, a global leader in the design and manufacture of multiparameter water quality sondes.[\/et_pb_slide][\/et_pb_slider][et_pb_slider disabled_on=&#8221;on|on|off&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; link_option_url=&#8221;https:\/\/www.solinst.com\/field-services\/?utm_source=solinst&#038;utm_medium=WC-global-sidebar-position2&#038;utm_campaign=FS-field-services&#8221; global_module=&#8221;53561&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_slide button_text=&#8221;Learn More&#8221; button_link=&#8221;https:\/\/www.solinst.com\/field-services\/?utm_source=solinst&amp;utm_medium=WC-global-sidebar-position2&amp;utm_campaign=FS-field-services&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;RGBA(255,255,255,0)&#8221; background_enable_color=&#8221;on&#8221; background_image=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/02\/solinst-field-services-sidebar.webp&#8221; background_enable_image=&#8221;on&#8221; custom_button=&#8221;on&#8221; button_bg_color=&#8221;#f58025&#8243; button_border_width=&#8221;2px&#8221; button_border_radius=&#8221;20px&#8221; button_font=&#8221;|600|||||||&#8221; global_colors_info=&#8221;{}&#8221; sticky_transition=&#8221;on&#8221;]<\/p>\n<h2><strong>Solinst Field Services<\/strong><\/h2>\n<p><strong><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><span>Safeguard your project\u2019s success and mitigate any potential for downtime or additional costs.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_slide][\/et_pb_slider][\/et_pb_column][et_pb_column type=&#8221;3_4&#8243; specialty_columns=&#8221;3&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;3676f7e6-7b83-4698-94ce-2cc9fa9ae43d&#8221; custom_padding=&#8221;0px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;RGBA(255,255,255,0)&#8221; custom_padding=&#8221;|||0px|false|false&#8221; custom_css_free_form=&#8221;width: 68%!important;||margin-right: 2%!important;&#8221; global_colors_info=&#8221;{}&#8221; background__hover_enabled=&#8221;on|hover&#8221; background_color__hover=&#8221;&#8221; background_enable_color__hover=&#8221;off&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; header_2_font_size=&#8221;24px&#8221; width=&#8221;100%&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2><strong>Why would I want to measure Fluorescein?<\/strong><\/h2>\n<p>Fluorescent dyes like Fluorescein are often added to water systems to provide water discharge and velocity data. Dye tracing studies can provide useful information for modelling surface and groundwater systems in addition to tracing contaminants. Fluorometers allow researchers to measure ultra-low concentrations of dye. With extreme sensitivity and instrument flexibility, researchers can glean powerful data that could potentially be missed when using less sensitive methods.   <\/p>\n<p>Fluorescein was the first fluorescent dye used for water tracing work, and is still used for detection by fluorometers, and for qualitative (visual) studies of underground contamination of wells. Fluorescein is used for flow measurements and circulation, dispersion, and plume studies, and can also be used for masking, hydraulic model studies, and underground water studies. <\/p>\n<h2><strong>How is Fluorescein Measured?<\/strong><\/h2>\n<p>Solinst Eureka\u2019s Fluorescein sensor is a <a href=\"https:\/\/www.solinst.com\/en-gb\/fluorometers\/\" title=\"Fluorometers: Water Quality Sensors\"><strong>fluorometric sensor<\/strong><\/a>. Fluorescence occurs when a molecule absorbs light energy at one wavelength and then emits that energy at a different wavelength. Fluorometric sensors emit light at a certain wavelength, and look for a very specific, different wavelength in return.  <\/p>\n<p>There are many variations of fluorescein dye and each compound will produce slightly shifted excitation and emission maxima. However, these small shifts shouldn\u2019t greatly affect the signal detected by the fluorometer, especially if the compound used in the study is the same compound used to calibrate your instrument. <\/p>\n<p><a href=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/\" title=\"Solinst Eureka Water Quality Probes\"><strong>Solinst Eureka<\/strong><\/a> Fluorescein sensor is configured to report directly proportional to the concentration of the dye present in the sample, up to 500 parts per billion (500 \u00b5g\/L). Relative fluorescence readings, dye concentrations, dilution factors, dye travel time, and other parameters provide valuable data used to draw conclusions regarding the water system being studied. <\/p>\n<h2><strong>What should I know about fluorescein measurement in the field?<\/strong><\/h2>\n<p>Dye tracers are compounds used for measuring, mapping, and monitoring water systems. Tracers are used for measuring water flows, studying, and modelling surface and ground water systems, tracing contaminants in emergency response situations, detecting leaks, and measuring tank retention times. Fluorescent tracers like fluorescein are chosen because they are cost-effective, and easily and accurately measured on-site with a portable field-ready fluorometer.  <\/p>\n<p>Fluorescein emits a brilliant green fluorescence, which gives an excellent visual or photographic contrast against the backgrounds normally encountered in water transport studies. Therefore, it is easy to visualise the progress of an experiment. It is more aesthetic than the red dyes. This is psychologically important, especially in ocean areas subject to the blooms of certain dinoflagellates, called \u201cred tides.\u201d Less public resistance may be encountered using a dye that does not resemble red tide.    <\/p>\n<p>For many studies, <a href=\"https:\/\/www.solinst.com\/en-gb\/water-quality-sensors\/rhodamine-sensors\/\" title=\"Rhodamine Sensors: Water Quality Monitoring\"><strong>Rhodamine<\/strong><\/a> has become the dye of choice over Fluorescein, due to fluorescein\u2019s rapid degradation in sunlight. Also, many naturally occurring fluorescent materials have similar characteristics, and thus interfere with fluorescein measurement. Fluorescein is also more pH-sensitive than rhodamine dyes. Fluorescence drops very sharply at pH values below 5.5. For optimum results, pH should be between 6 and 10.    <\/p>\n<p>Fouling is the biggest field problem for fluorescence sensors. Any foreign material that accumulates on the active surface of the sensor will either reduce the amount of emitted light or received light, or both. Fouling typically does not pose a problem when profiling or spot checking for daily surveys; only when deployed for extended periods. For continuous deployment, anti-fouling accessories may be added, such as Eureka\u2019s universal wiper system, and copper mesh sensor guard.   <\/p>\n<p>[\/et_pb_text][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;RGBA(255,255,255,0)&#8221; custom_css_free_form=&#8221;width: 30%!important;&#8221; global_colors_info=&#8221;{}&#8221; background_color__hover=&#8221;&#8221; background__hover_enabled=&#8221;on|hover&#8221; background_enable_color__hover=&#8221;off&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/03\/solinst-eureka-fluorescein-sensors.webp&#8221; alt=&#8221;fluorescein dye sensors by solinst eureka for water quality monitoring applications&#8221; title_text=&#8221;Fluorescein Dye Sensors By Solinst Eureka For Water Quality Monitoring Applications&#8221; align=&#8221;center&#8221; align_tablet=&#8221;center&#8221; align_phone=&#8221;center&#8221; align_last_edited=&#8221;on|tablet&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin_tablet=&#8221;20px||||false|false&#8221; custom_margin_phone=&#8221;20px||||false|false&#8221; custom_margin_last_edited=&#8221;on|tablet&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; header_2_font_size=&#8221;24px&#8221; width=&#8221;100%&#8221; custom_margin=&#8221;30px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2 style=\"text-align: left;\"><strong>Fluorescence Sensors for<br \/>Water Quality Sondes<\/strong><\/h2>\n<div class=\"jqw1mt QfrfFD cell\">\n<div dir=\"ltr\">\n<ul data-hook=\"stacked-info-section\" class=\"wEn8Wy\"><\/ul>\n<ul>\n<li><strong>Range<br \/><\/strong><span>0 to 150 ppb<\/span><\/li>\n<li><strong>Accuracy<br \/><\/strong><span>linearity of 0.99 R\u00b2<\/span><\/li>\n<li><strong>Resolution<br \/><\/strong><span>0.01<\/span><\/li>\n<li><strong>Units<\/strong><br \/><span>ppb<\/span><\/li>\n<li><strong>Calibration<br \/><\/strong>lab-qualified sample<\/li>\n<li><strong>Maintenance<br \/><\/strong><span>cleaning and calibration<\/span><\/li>\n<li><strong>Sensor Life<\/strong><br \/><span>5+ years<\/span><\/li>\n<li><strong>Sensor Type<br \/><\/strong><span>fluorescence<\/span><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p>[\/et_pb_text][et_pb_button button_url=&#8221;@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjQ1ODA3In19@&#8221; button_text=&#8221;Get Quote&#8221; admin_label=&#8221;get quote button&#8221; _builder_version=&#8221;4.27.4&#8243; _dynamic_attributes=&#8221;button_url&#8221; _module_preset=&#8221;c9e00792-1360-4998-8cf9-5f6772c944ba&#8221; global_module=&#8221;46404&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_button][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;40px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2><strong>Features of Solinst Eureka\u2019s Fluorescein Sensors<br \/><\/strong><\/h2>\n<p>Solinst Eureka uses Fluorescein sensors in our MantaPlus multiparameter sondes. They can be configured to include any of our dye trace fluorometers. The Fluorescein sensor may be installed in the probe, along with other sensors such as additional fluorometers, turbidity, dissolved oxygen, pH and conductivity. This makes for a cost-effective approach, as there is no need to buy a dedicated fluorometer. Operation is made easy, as the Fluorescein sensor is controlled by the Manta Control software, like other installed sensors. When only the Fluorescein sensor is needed, it may be installed stand-alone on one of Eureka\u2019s smaller probes, such as the Trimeter. The Trimeter with internal battery pack, for self-powered logging, is a popular configuration used for dye trace studies, both short and long term.      <\/p>\n<p>Solinst Eureka\u2019s Fluorescein fluorometer, installed in a Trimeter or MantaPlus multiprobe, provides an excellent tracer system. MantaPlus and Trimeter Multiprobes may be configured as loggers with battery packs for autonomous self-powered deployment, used with field displays for site-to-site spot checking, or connected to data telemetry stations for real-time remote monitoring. Eureka sondes equipped with fluorometers are portable, durable, and cost-effective.   <\/p>\n<p>[\/et_pb_text][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||9px|||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner saved_specialty_column_type=&#8221;3_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2><strong>Related Products<\/strong><\/h2>\n<p>[\/et_pb_text][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; disabled_on=&#8221;off|off|off&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;0px||1em||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; border_width_bottom=&#8221;1px&#8221; border_color_bottom=&#8221;#d3d3d3&#8243; global_module=&#8221;69009&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner type=&#8221;1_2&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/01\/solinst-eureka-multi-parameter-probes.webp&#8221; alt=&#8221;solinst eureka multi-parameter water probes&#8221; title_text=&#8221;Solinst Eureka Multi-parameter Water Probes&#8221; url=&#8221;@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjY1MDM3In19@&#8221; _builder_version=&#8221;4.27.4&#8243; _dynamic_attributes=&#8221;url&#8221; _module_preset=&#8221;default&#8221; border_color_all=&#8221;#bcbcbc&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; header_2_line_height=&#8221;1.3em&#8221; custom_margin=&#8221;60px||||false|false&#8221; custom_margin_tablet=&#8221;0px||||false|false&#8221; custom_margin_phone=&#8221;0px||||false|false&#8221; custom_margin_last_edited=&#8221;on|desktop&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3><a href=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/water-quality-sondes\/manta-plumultiparameter-probes\/\" title=\"Manta Series Water Quality Probes\">Manta Series Water Quality Probes<\/a><\/h3>\n<p><a href=\"https:\/\/www.solinst.com\/instruments\/solinst-eureka\/\" title=\"Solinst Eureka Water Quality Probes\"><strong>Solinst Eureka<\/strong><\/a><span>  offers the largest selection of water quality sensor technologies in the industry. So in addition to standard configurations, each probe may be customised for your specific application. Pick sensors of your choice to fully populate larger probes, or add a battery pack to convert a probe to a logging device.  <\/span><\/p>\n<p>[\/et_pb_text][et_pb_button button_url=&#8221;@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjY1MDM3In19@&#8221; button_text=&#8221;Manta Water Quality Sondes&#8221; button_alignment=&#8221;left&#8221; button_alignment_tablet=&#8221;center&#8221; button_alignment_phone=&#8221;center&#8221; button_alignment_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.27.4&#8243; _dynamic_attributes=&#8221;button_url&#8221; _module_preset=&#8221;default&#8221; custom_button=&#8221;on&#8221; button_text_size=&#8221;18px&#8221; button_text_color=&#8221;#000000&#8243; button_bg_color=&#8221;#FFFFFF&#8221; button_border_color=&#8221;#ff8500&#8243; button_border_radius=&#8221;20px&#8221; button_icon=&#8221;&#x3d;||divi||400&#8243; custom_padding=&#8221;0px|||||&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_button][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; disabled_on=&#8221;off|off|off&#8221; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; border_width_bottom=&#8221;1px&#8221; border_color_bottom=&#8221;#d3d3d3&#8243; global_module=&#8221;69010&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner type=&#8221;1_2&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/03\/5001-trimeter-water-quality-sonde-965&#215;500-1.webp&#8221; alt=&#8221;solinst eureka trimeter water quality sondes&#8221; title_text=&#8221;Solinst Eureka Trimeter Water Quality Sondes&#8221; url=&#8221;@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjY0OTQwIn19@&#8221; _builder_version=&#8221;4.27.4&#8243; _dynamic_attributes=&#8221;url&#8221; _module_preset=&#8221;default&#8221; border_color_all=&#8221;#bcbcbc&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; header_2_line_height=&#8221;1.3em&#8221; custom_margin=&#8221;60px||||false|false&#8221; custom_margin_tablet=&#8221;0px||||false|false&#8221; custom_margin_phone=&#8221;0px||||false|false&#8221; custom_margin_last_edited=&#8221;on|desktop&#8221; link_option_url=&#8221;https:\/\/www.solinst.com\/products\/level-measurement-devices\/103-tag-line\/&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3><a href=\"https:\/\/www.solinst.com\/en-gb\/trimeter\/\" title=\"Manta Trimeter Water Quality Probe\">Manta Trimeter Water Quality Probe<\/a><\/h3>\n<p><span>The <a href=\"https:\/\/www.solinst.com\/en-gb\/trimeter\/\" title=\"Trimeter Low Cost Water Quality Sonde\"><strong>Trimeter<\/strong><\/a> holds any one sensor* from the Sensor Parameters list, plus temperature and depth sensors (both are optional). For example, a Trimeter configuration could be turbidity, temperature, and depth. Another example could be DO and temperature.  <\/span><\/p>\n<p>[\/et_pb_text][et_pb_button button_url=&#8221;@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjY0OTQwIn19@&#8221; button_text=&#8221;Manta Trimeter Water Quality Probe&#8221; button_alignment=&#8221;left&#8221; button_alignment_tablet=&#8221;center&#8221; button_alignment_phone=&#8221;center&#8221; button_alignment_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.27.4&#8243; _dynamic_attributes=&#8221;button_url&#8221; _module_preset=&#8221;default&#8221; custom_button=&#8221;on&#8221; button_text_size=&#8221;18px&#8221; button_text_color=&#8221;#000000&#8243; button_bg_color=&#8221;#FFFFFF&#8221; button_border_color=&#8221;#ff8500&#8243; button_border_radius=&#8221;20px&#8221; button_icon=&#8221;&#x3d;||divi||400&#8243; custom_padding=&#8221;0px|||||&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_button][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; disabled_on=&#8221;off|off|off&#8221; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; border_width_bottom=&#8221;1px&#8221; border_color_bottom=&#8221;#d3d3d3&#8243; global_module=&#8221;69121&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner type=&#8221;1_2&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/03\/5001-easyprobe-water-quality-sondes.webp&#8221; alt=&#8221;solinst eureka easyprobe water quality sondes&#8221; title_text=&#8221;Solinst Eureka EasyProbe Water Quality Sondes&#8221; url=&#8221;@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjY1MTQ3In19@&#8221; _builder_version=&#8221;4.27.4&#8243; _dynamic_attributes=&#8221;url&#8221; _module_preset=&#8221;default&#8221; border_color_all=&#8221;#bcbcbc&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; header_2_line_height=&#8221;1.3em&#8221; custom_margin=&#8221;60px||||false|false&#8221; custom_margin_tablet=&#8221;0px||||false|false&#8221; custom_margin_phone=&#8221;0px||||false|false&#8221; custom_margin_last_edited=&#8221;on|desktop&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3><a href=\"https:\/\/www.solinst.com\/en-gb\/easyprobe-water-quality-sonde\/\" title=\"EasyProbe: Water Quality Sondes\">EasyProbe: Water Quality Sondes<\/a><\/h3>\n<p><span>The <a href=\"https:\/\/www.solinst.com\/en-gb\/easyprobe-water-quality-sonde\/\" title=\"EasyProbe Water Quality Sonde\"><strong>EasyProbe<\/strong><\/a>, by Solinst Eureka, is a high-performance, cost-effective water quality monitor. It&#8217;s ideal for spot-checking, remote telemetry, education, research, aquaculture, and more. The EasyProbe20 includes sensors for temperature, dissolved oxygen, conductivity, and pH, while the EasyProbe30 adds a turbidity sensor. Eureka multiprobes are known for their reliability, with a three-year warranty covering all sensors, and have the lowest maintenance costs in the industry.   <\/span><\/p>\n<p>[\/et_pb_text][et_pb_button button_url=&#8221;@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjY1MTQ3In19@&#8221; button_text=&#8221;Manta Easy Probe Water Quality Sondes&#8221; button_alignment=&#8221;left&#8221; button_alignment_tablet=&#8221;center&#8221; button_alignment_phone=&#8221;center&#8221; button_alignment_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.27.4&#8243; _dynamic_attributes=&#8221;button_url&#8221; _module_preset=&#8221;default&#8221; custom_button=&#8221;on&#8221; button_text_size=&#8221;18px&#8221; button_text_color=&#8221;#000000&#8243; button_bg_color=&#8221;#FFFFFF&#8221; button_border_color=&#8221;#ff8500&#8243; button_border_radius=&#8221;20px&#8221; button_icon=&#8221;&#x3d;||divi||400&#8243; custom_padding=&#8221;0px|||||&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_button][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; disabled_on=&#8221;off|off|off&#8221; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; border_width_bottom=&#8221;1px&#8221; border_color_bottom=&#8221;#d3d3d3&#8243; global_module=&#8221;44627&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner type=&#8221;1_2&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/01\/3001-levelogger-5-ltc.webp&#8221; alt=&#8221;solinst levelogger 5 ltc water level water temperature and water conductivity datalogger&#8221; title_text=&#8221;Solinst Levelogger 5 LTC Water Level Water Temperature And Water Conductivity Datalogger&#8221; url=&#8221;https:\/\/www.solinst.com\/products\/dataloggers-and-telemetry\/3001-levelogger-series\/ltc-levelogger\/&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; border_color_all=&#8221;#bcbcbc&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; header_2_line_height=&#8221;1.3em&#8221; custom_margin=&#8221;60px||||false|false&#8221; custom_margin_tablet=&#8221;0px||||false|false&#8221; custom_margin_phone=&#8221;0px||||false|false&#8221; custom_margin_last_edited=&#8221;on|desktop&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3>Water Level, Temperature &amp; Conductivity Datalogging<\/h3>\n<p>The <a href=\"https:\/\/www.solinst.com\/products\/dataloggers-and-telemetry\/3001-levelogger-series\/ltc-levelogger\/\" title=\"Levelogger 5 LTC Level Temperature and Conductivity Datalogger\"><strong>Levelogger 5 LTC<\/strong><\/a> measures and logs water level fluctuations, temperature and conductivity. It is programmed to record at intervals as often as 2 seconds. It includes an 8-year battery, memory for 100,000 sets of readings, and comes in 6 pressure ranges. A PFAS-free coating (inside and out) provides superior corrosion and abrasion resistance.   <\/p>\n<p>[\/et_pb_text][et_pb_button button_url=&#8221;https:\/\/www.solinst.com\/products\/dataloggers-and-telemetry\/3001-levelogger-series\/ltc-levelogger\/&#8221; button_text=&#8221;Versatile Conductivity Datalogger&#8221; button_alignment=&#8221;left&#8221; button_alignment_tablet=&#8221;center&#8221; button_alignment_phone=&#8221;center&#8221; button_alignment_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_button=&#8221;on&#8221; button_text_size=&#8221;18px&#8221; button_text_color=&#8221;#000000&#8243; button_bg_color=&#8221;#FFFFFF&#8221; button_border_color=&#8221;#ff8500&#8243; button_border_radius=&#8221;20px&#8221; button_icon=&#8221;&#x3d;||divi||400&#8243; custom_padding=&#8221;0px|||||&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_button][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner column_structure=&#8221;1_2,1_2&#8243; disabled_on=&#8221;off|off|off&#8221; _builder_version=&#8221;4.27.2&#8243; _module_preset=&#8221;default&#8221; border_width_bottom=&#8221;1px&#8221; border_color_bottom=&#8221;#d3d3d3&#8243; global_module=&#8221;44750&#8243; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner type=&#8221;1_2&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/01\/107-tlc-meter.webp&#8221; alt=&#8221;solinst model 107 tlc meter for temperature and conductivity profiling&#8221; title_text=&#8221;Solinst Model 107 TLC Meter For Temperature And Conductivity Profiling&#8221; url=&#8221;https:\/\/www.solinst.com\/products\/level-measurement-devices\/107-tlc-meter\/&#8221; align=&#8221;center&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; max_width=&#8221;100%&#8221; border_color_all=&#8221;#bcbcbc&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column_inner][et_pb_column_inner type=&#8221;1_2&#8243; _builder_version=&#8221;4.25.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; header_2_line_height=&#8221;1.3em&#8221; custom_margin=&#8221;60px||||false|false&#8221; custom_margin_tablet=&#8221;0px||||false|false&#8221; custom_margin_phone=&#8221;0px||||false|false&#8221; custom_margin_last_edited=&#8221;on|desktop&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3>TLC Meter \u2013 Measure Accurate Temperature, Level &amp; Conductivity<\/h3>\n<p>A <a href=\"https:\/\/www.solinst.com\/products\/level-measurement-devices\/107-tlc-meter\/\" title=\"TLC Meter Water Temperature and Water Conductivity Profiling\"><strong>TLC Meter<\/strong><\/a> provides accurate, stable temperature and conductivity measurements, displayed on a convenient LCD display for easy reading. Static water level and depth of readings are read off Solinst flat tape, which is precisely laser-marked every mm or 1\/100 ft. 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**************\/<!-- [et_pb_line_break_holder] -->var s_code=s.t();if(s_code)document.write(s_code)\/\/--><\/script><!-- [et_pb_line_break_holder] --><script language=\"JavaScript\" type=\"text\/javascript\"><!--<!-- [et_pb_line_break_holder] -->if(navigator.appVersion.indexOf('MSIE')>=0)document.write(unescape('%3C')+'!-'+'-')<!-- [et_pb_line_break_holder] -->\/\/--><\/script><noscript><a href=\"https:\/\/www.omniture.com\" title=\"Web Analytics\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/solinst.d2.sc.omtrdc.net\/b\/ss\/solinst-prod\/1\/H.21--NS\/0\" height=\"1\" width=\"1\" border=\"0\" alt=\"\"><\/a><\/noscript><!--\/DO NOT REMOVE\/--><!-- [et_pb_line_break_holder] --><!-- End SiteCatalyst code version: H.21. -->[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fluorescein Sensors: Water Quality Monitoring<div class=\"et_pb_module dsm_breadcrumbs dsm_breadcrumbs_0\">\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t<div class=\"et_pb_module_inner\">\n\t\t\t\t\t<nav class=\"dsm_breadcrumbs_wrap\">\n\t\t\t\t<ul class=\"dsm_breadcrumbs\" itemscope itemtype=\"https:\/\/schema.org\/BreadcrumbList\">\t\t\t<li class=\"dsm_breadcrumbs_item dsm_home_item dsm_home_item_custom\" itemprop=\"itemListElement\" itemscope\n\t\t\titemtype=\"https:\/\/schema.org\/ListItem\">\n\t\t\t\t<a href=\"https:\/\/www.solinst.com\/en-gb\/\" itemprop=\"item\" target=\"\">\n\t\t\t\t\t<span class='dsm_home_text_wrapper'>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"et-pb-icon dsm_home_icon\">\ue009<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"dsm_home_text\" itemprop=\"name\">\n\t\t\t\t\t\t\t\tHome\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t<\/a>\n\t\t\t\t<meta itemprop=\"position\" content=\"1\" \/>\n\t\t\t<\/li>\n\n\t\t<li class=\"dsm_breadcrumbs_separator\"> <span class=\"et-pb-icon dsm_separator_icon\">5<\/span><\/li><\/ul>\n\t\t\t<\/nav>\n\t\t\t\t<\/div>\n\t\t\t<\/div> Solinst Eureka2113 Wells Branch Pkwy, Suite 4400Austin, TX, USA78728 Tel: +1 512-302-4333Fax: +1 512-251-6842email: eureka@solinst.com Water Quality Probes Solinst Eureka, a global leader in the design and manufacture of multiparameter water quality sondes.Solinst Field Services &nbsp; &nbsp; &nbsp; Safeguard your project\u2019s success and mitigate any potential for downtime or additional costs. &nbsp; &nbsp;Why would I want to measure Fluorescein? Fluorescent dyes like Fluorescein are often added to water systems to provide water discharge and velocity data. Dye tracing studies can provide useful information for modelling surface and groundwater systems in addition to tracing contaminants. Fluorometers allow researchers to measure ultra-low concentrations of dye. With extreme sensitivity and instrument flexibility, researchers can glean powerful data that could potentially be missed when using less sensitive methods. Fluorescein was the first fluorescent dye used for water tracing work, and is still used for detection by fluorometers, and for qualitative (visual) studies of underground contamination of wells. Fluorescein is used for flow measurements and circulation, dispersion, and plume studies, and can also be used for masking, hydraulic model studies, and underground water studies. How is Fluorescein Measured? Solinst Eureka\u2019s Fluorescein sensor is a fluorometric [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":220137,"parent":220652,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"folder":[308],"class_list":["post-220194","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Fluorescein Sensors: Water Quality Monitoring<\/title>\n<meta name=\"description\" content=\"Fluorescein Sensors: Water Quality Monitoring, used for water tracing work, and is still used for detection by fluorometers\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.solinst.com\/en-gb\/products\/solinst-eureka\/water-quality-sensors\/fluorescein-sensors\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Solinst Eureka Fluorescein Sensors\" \/>\n<meta property=\"og:description\" content=\"Explore fluorescein sensors and their role in water quality tracking and contaminant tracing. Enhance your project\u2019s success today.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.solinst.com\/en-gb\/products\/solinst-eureka\/water-quality-sensors\/fluorescein-sensors\/\" \/>\n<meta property=\"og:site_name\" content=\"Solinst Groundwater and Surface Water Monitoring Instrumentation, Water Level Meters, Interface Meters, Dataloggers\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-07T21:15:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.solinst.com\/wp-content\/uploads\/2025\/06\/featureimages-eureka-fluorometric-sensor.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Solinst Eureka Fluorescein Sensors\" \/>\n<meta name=\"twitter:description\" content=\"Explore fluorescein sensors and their role in water quality tracking and contaminant tracing. 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