The Solinst AquaVent is designed to be maintenance free, using hydrophobic filters and permanent factory installed desiccants, with convenient user replaceable wellhead batteries and custom designed durable vented cable. The AquaVent features highly accurate gauged pressure sensor, temperature sensor and datalogger .Model 3500 AquaVent vented water level datalogger, effective immediately. Improvements in production capabilities and manufacturing efficiencies have enabled us to reprice this quality product. We are pleased to pass this along to our customers, making the AquaVent an even more attractive solution for water level monitoring applications. As a reminder, the AquaVent comes with our 3 Year Warranty. Please contact us here at Solinst if you have any questions and would to talk to one of our technical representatives about your application.