HIGH ACCURACY PH METER: PH meter use sensitive glass bulb electrode sensor that can quickly and clearly read accurate PH values in the 0-14.0 measurement range. This accurate PH tester kit (0.01 resolution) is so accurate, it can accurately test a PH of 0.01 AUTOMATIC CALIBRATION: PH meter has an automatic calibration function that can be adjusted according to water temperature and quality, and the PH reading can be obtained by just waiting a few seconds in the testing. As well, you can calibrate the tester with the one-touch button CAL using Calibration Buffer Powder AUTOMATIC TEMPERATURE COMPENSATION: PH meter has a built-in temperature sensor. When the temperature of the sample solution is different from that of the standard solution, the automatic temperature compensation system (ATC) will adjust its temperature to accurately measure the ph value of the sample at 0 C-80 C (32 F-176 F) EXTENSIVELY TESTED: Conveniently fits in your pocket or bag and goes anywhere. PH meter is an ideal option for families and laboratory testing PH value, which suitable for the testing PH balance of drinking water, pool, aquarium, RO system, Spa, or hydroponics; Appropriate for a wide range of applications COMPLETE ACCESSORIES: Come with 1x PH meter, 1x user manual, 2x 1.5V LR44 button cells(build-in), 3x PH Buffer Powders. The enclosed detailed manual will show you how to get the best accurate and stable reading