Water Level Temperature Meter Measurement Principles

solinst water level temperature meter with laser marked flat tape

When the zero point of the 201 Water Level Temperature Meter Probe enters water, an electric circuit is completed, activating the buzzer and light. The depth to water is then read off the flat tape.

Temperature readings are read off the LCD display. As the probe is lowered to take temperature measurements at discrete depths, the buzzer can be turned off by pressing the button two times quickly. This is ideal when profiling temperature.

A Tape Guide allows depth measurements to be read at the marked position on the Tape Guide, to give reliable, repeatable, accurate depth measurements when profiling a well. The Tape Guide protects the tape from damage on rough edges of well casing.


Laser Marked Flat Tape

The Water Level Temperature Meter uses extremely durable flat tape. The tape is non-stretch and has a dog bone design that prevents adherence to wet surfaces. The tape reels smoothly, remains flexible and hangs straight, regardless of temperature. It is also easy to repair and splice.

The 3/8" (10 mm) wide tape has permanent laser markings every 1/100 ft. or each millimeter, traceable to NIST and EU measurement standards.

solinst water level temperature meter flat tape markings

LM2: Feet and tenths: with markings every 1/100 ft.
LM3: Meters and centimeters: with markings every mm


Water Temperature Display Menu

When the meter is turned on, the LCD screen displays the firmware version of the WLT Meter (e.g. "WLTM 1.0") for about two seconds. The LCD will then display the temperature reading, in or out of water.

The LCD menu is simple to operate. Pressing the button two times quickly deactivates the buzzer (the light stays active). To reactivate, press the button two times quickly. To turn the meter off, press and hold the button for two seconds.


WLT Meter Specifications
Temperature range: -20.00°C to +125.00°C
Temperature reading accuracy: +/-0.10ºC from -5ºC to +50ºC;
+/-0.50ºC outside of that range
Temperature resolution: 0.01ºC
Temperature stabilization time: 15 seconds per ºC
Probe pressure rating: Fully submerged tape – all lengths
Probe weight: 87 grams (3.07 ounces)
Probe size: 16 mm dia., 129 long (5/8" x 5.08")
Wetted materials (tape/probe): PVDF, Santoprene, Delrin®, Viton®, 316 stainless steel
Battery life: 90 hours
Auto-off: 8 minutes
Standard Tape lengths: Meters: 30, 60, 100, 150, 250, 300
Feet: 100, 200, 300, 500, 750, 1000


Other Options

solinst power winder installed onto 201 water level temperature meter for easier water temperature profiling


carrying case

Power Winder: Lightweight and easy to attach to small, medium and large reel frames, the Power Winder is designed to allow effortless winding of longer lengths of tape. The Power Winder makes temperature profiling with the Model 201 Water Level Temperature Meter easy. Simply uses a standard power drill to operate the Power Winder (see 101 Power Winder Data Sheet).

Carrying Case: An optional padded nylon carrying bag with a shoulder strap is available to fit medium and small reels. The sturdy bags have a zippered top and front pocket and a vent in the base to allow moisture to dissipate. They provide protection during transport as well as handling convenience.

Replacement Parts: Replacement probes, tapes, faceplates and other spare parts are available.