Solinst-Model 3500- AquaVent Datalogger

The AquaVent features highly accurate gauged pressure sensor, temperature sensor and datalogging within a 7/8″ x 7″ (22 mm x 178 mm) stainless steel housing.The AquaVent uses a gauged pressure transducer; it is open to the atmosphere via a vented cable to surface. Atmospheric pressure is applied to the transducer diaphragm, providing a cancellation effect for barometric pressure. This results in actual water level recordings. Has built-in desiccants and hydrophobic filters.