The LevelVent uses a vented pressure transducer to provide accurate datalogging (0.05% FS) of water levels that are automatically compensated for barometric effects. The LevelVent logger contains a Hastelloy pressure sensor, temperature sensor, 10-year battery, and FRAM memory within a 22 mm x 178 mm (7/8" x 7") stainless steel housing. A Vented Cable connects the downhole logger to a compact Wellhead that seats inside a Solinst 2" Well Cap Assembly. Custom Vented Cables are available to 500 ft. For permanent moisture protection the Wellhead and logger contain built-in desiccants and hydrophobic filters. The Wellhead easily connects with Solinst software and accessories.