The Rugged BaroTROLL Data Logger measures and logs barometric pressure and temperature to compensate for water level changes due to barometric fluctuations. Save money and time in the field with this durable logger featuring titanium construction and 10+ year internal battery. Easy-to-use software and flexible download options give you quick data access via telemetry, direct-read cable or docking station. Correct multiple data logger files from a single unit, and easily graph data, generate reports and export files to Excel or other applications.