PH Meter: PH meter uses sensitive glass bulb electrode sensor that can quickly and clearly read accurate PH values in the 0-14.0 measurement range. This PH tester kit has 0.01 resolution, it can test a PH of 0.01AUTOMATIC 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 during testing. You can calibrate the tester with the one-touch button CAL using Calibration Buffer PowderAUTOMATIC 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°FTESTING APPLICATIONS: Fits in your pocket or bag and goes anywhere. PH meter is compatible with families and laboratory testing PH value, which compatible with testing PH balance of drinking water, pool, aquarium, RO system, Spa, or hydroponics; compatible with a wide range of applicationsACCESSORIES: Come with 1x PH meter, 1x user manual, 2x 1.5V LR44 button cells built-in, 3x PH Buffer Powders. The enclosed detailed manual will show you how to get the best accurate and stable reading