Measures Conductivity, TDS, Salinity, Resistivity, pH, mV and Temperature Automatic one button pH calibration (4, 7, and 10pH) Choice of 3 point pH calibration for better accuracy One point Conductivity calibration - automatically recognizes 8 calibration solutions from USA, Europe and China series Automatic Temperature Compensation (non-linear compensation for purified water <10"S/cm to improve measuring accuracy) Memory stores up to 300 readings with series number, measured value and temperature Large blue backlit dual LCD display Auto power off saves battery life with disable function