Measuring range: 0.00-14.00PHAccuracy error: 0.01PHResolution: 0.01PHCalibration method: 3-point automatic calibrationElectrode: Glass BubblePH meter 1 + 3 packs of calibration powder HIGH ACCURACY PH METER: PH meters use sensitive glass bulb electrode sensors 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: The 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 the Calibration Buffer Powder. 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 is suitable for the testing PH balance of drinking water, pool, aquarium, Spa, or hydroponics; Appropriate for a wide range of applications."