ExStik® II Conductivity/TDS/Salinity Meter is a waterproof water quality tester that can measure conductivity, TDS, salinity and temperature. It features autoranging meter, three ranges of measurements, adjustable conductivity to TDS ratio factor, large digital display screen, data hold, auto power off, low battery indication, automatic temperature compensation, internal memory storage, self calibration, easy to replace conductivity battery and waterproof design.