Description "Make sure your swimming pool, general hydroponic pH or even drinking water has perfect pH balance and safe to use with pH accuracy. The tester has a sensitive electrode sensor to read 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 adjusts to water temperature and water quality to give pH readings almost instantly. No more worrying about the temperature of the test liquid, as the pH meter has built-in automatic temperature compensation (ATC), so it can accurately determine the pH value of the sample at any what temperature in the 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 with 1x pH meter, 2x 1.5V LR44 button cells (integrated) " package:1pH meter .