Make sure your swimming pool, general hydroponic pH or even drinking water has perfect pH balance and safe to use with pH accuracy. accurate pH levels The detailed manual included will show you how to get the best accuracy and stable reading ^ The pH meter has an automatic temperature compensation feature that adapts to the temperature of water and water quality to give pH readings almost instantly. Plus, you can calibrate the tester with a one-touch button using the Buffer Powder.^ No longer need to worry about the temperature of the test liquid, as the pH meter has built-in automatic temperature compensation (ATC), so that it can accurately determine the pH value of the sample at no any temperature within a range of 0C - 80C (32F - 176F) ^ Ideal for home or laboratory use, suitable for testing ph balance of drinking water, swimming pool, aquarium, Ro system, spa or hydroponics; Suitable for a wide range of applications ^ Comes complete with 1x pH meter, 1x user manual, 2x 1.5V LR44 button cells (integrated)