ATC functionautomatic temperature compensation range is 0-80C, digital TDS meters range is 0-9990ppm, accuracy is 2%, and the range of pH pen measurement is 0-14.00 pH. Easy to useJust remove the protective cap and immerse the pH meter electrode in the solution and clean. press the ON/OFF button to measure. The tester has a sensitive electrode sensor to read accurate pH levels from 0 to 14. Ensure your swimming pool, general hydroponic pH or even drinking water has perfect pH balance and offers risk-free use. Auto Calibration the pH tester has a stabilization function Automatic temperature sensor that adjusts to water temperatures and quality to give pH readings almost instantly. You can also calibrate the tester with just one button using the buffer solution. Automatic temperature compensationThere is no need to worry about the temperature of the liquid to be tested anymore, the pH meter has built-in Automatic Temperature Compensation (ATC). Thus, it can accurately determine the pH value of the sample at any temperature within the range of 0C to 60C. Wild ApplicationEasily slips into your pocket or your bag and goes anywhere. The pH meter is an ideal option for families and laboratory testing of pH value, which is suitable for pH balance test of drinking water, swimming pool, aquarium, RO system , spa or hydroponics; Suitable for a wide range of applications. Number of pieces supplied: 1 Color: random (yellow, blue, red) Size: 155x31mm Note: The data is manual measurement, please allow 1-81cm error, due to differences between light and screen, there will be a certain color difference , the specific received in kind shall prevail.