The Extech PH300 pH/Temperature Kit measures pH, mV, and temperature at your workbench or in the field. It has automatic, one button calibration of 4, 7 and 10 pH with a choice of three point calibration, for better accuracy and automatic temperature compensation. Memory stores up to 200 readings with series number, measured value, and temperature. The meter has a large, blue, backlit LCD display screen with an auto power off function plus disable function that saves battery life. The IP57 waterproof housing protects it from moisture and the elements. Comes with a pH/mV/temp electrode, a protective rubber holster, the pH calibration solutions (4, 7, and 10 pH), two AA batteries, hard carrying case, and user manual.