1.LCD shows both pH & temp.. 2.Pen type digital pH meter 3.Water proof 4.Easy to change the pH electrode Features:Data hold function for freezing the desired value.Auto power off without operation in 20 mins.Microcomputer circuit, intelligent function, high accuracy. Compact size, light weightAuto calibration for pH 4.01, pH 7.00 and pH 10.01 PT-6020 PH meter ,Water proof PH meter