Easy, fast and high precision: Simply remove the protective cap and immerse the pH meter electrode in the solution and press the ON or 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 provides risk-free use Auto Calibration: Auto Calibration: The pH tester has an automatic temperature stabilization feature that adjusts to temperatures and water quality to give pH readings almost instantly. You can also calibrate the tester with one button using buffer solution Automatic temperature compensation: There is no longer any need to worry about the temperature of the liquid to be tested, as 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 a range of 0C to 60C Many uses: Ideal for home or laboratory use, suitable for testing pH balance of drinking water, for RO system for aquarium, swimming pool, SPA, or hydroponics. Suitable for a wide range of applications Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.