The Extech EC600 Kit 7-in-1, measures Conductivity, TDS, Salinity, Resistivity, pH, mV and Temperature. It has automatic one button calibration of 4, 7 and 10 pH with a choice of three point calibration for better accuracy and it provides automatic temperature compensation. One point conductivity calibration automatically recognizes eight calibration solutions from USA, Europe, and China. Memory stores up to 300 readings with series number, measured value and temperature. The meter has a large, blue, backlit LCD display screen with an auto power off function with disable that saves battery life. The IP57 waterproof housing protects it from the elements.