HANNA PH TESTER PHEP�4 pH/Temperature AUTOCALIBRATION WATERPROOF 0.1 pH resolutionThe Hanna pHep4 waterproof tester is an advanced meter that has many features found in more expensive portable and benchtop meters. This ergonomic meter features automatic one or two point calibration to known buffer, automatic temperature compensation, battery percent level indicator at start up, and a stability indicator to alert the user when a stable reading has been obtained. The large multi level LCD display that shows both pH and temperature