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 0.01 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 during testing. 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 TESTING 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 applications ACCESSORIES: 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