Easy, Fast & High Accuracy: Simply remove the protective cap and immerse the pH meter electrode into the solution and 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 pool, general hydroponic pH or even drinking water has a perfect pH balance and offers risk-free use. Auto Calibration: The pH tester has an automatic temperature stabilization function that adjusts to water temperatures and quality to give pH readings almost instantly. You can also calibrate the tester with a single button using the buffer solution. Automatic Temperature Compensation: There is no need to worry about the temperature of the liquid being tested, as the pH meter has built-in Automatic Temperature Compensation (ATC). So it can accurately determine the pH value of the sample at any temperature over a range of 0 C to 60 C Widely Uses: Ideal for home or laboratory use, suitable for testing the pH balance of drinking water, for RO system for aquarium, swimming pool, SPA, or hydroponics. Suitable for a wide range of applications Product Size: 155 mm 31 mm (W) 18 mm (H) Comes with 1 x pH meter, 2 x LR44 1.5 V button batteries (built-in),