Automatically Calibrate pH Tester---Press MODE/CAL for 5 seconds to enter the calibration mode, press in to select the powders corresponding to 6.86, 4, and 9.18 to complete the calibration.Automatically calibrate pH Tester, measure water quality in all directions, ensure healthy water quality, and take care of the health of you and your family 3-in-1 pH Meter---PH meter has a three-in-one function, which can accurately measure pH, TDS and temperature values with high precision at the same time.Digital water pH tester adopts high-precision algorithm chips and electrodes to ensure accurate and fast response High Sensitive Glass Probe---Designed with high sensitive glass probe, easily get a full measurement range of 0-14pH, 0.01 pH resolution. Press the automatic calibration button, the water pH meter will automatically recognize the calibration, easy and convenient Multifunctional pH Meter for Water---The hydroponic pH meter uses a backlit LCD, which can clearly see the displayed value in both day and night environments. Automatic Temperature Compensation (ATC) perfectly solves the errors that may be caused by liquid temperature changes, making pH readings more accurate. In addition, the pH meter has a test result lock function for easy reading and recording Portable & Best Gift for Health---The mini size pH meter allows you to easily put it in your pocket and take measurements anytime, anywhere. Ideal for accurate measurement of pH in drinking water, spa, brewing beer, swimming pools, aquariums and other hydroponics. It is also the best gift for you to protect the health of you and your family and friends