AUTOMATIC CALIBRATION-This digital pH meter factory calibrated, this digital pH tester gets the result fast and accurate, the digital pH tester has automatic temperature compensation function which is Adapts to water temperature and water quality to give pH readings almost instantly HIGH ACCURACY - The water pH meter has a sensor sensitive electrode to read accurate pH levels. The included detailed manual will show you how to get the best accurate and stable reading, ensure your pool, general hydroponic pH or even drinking water has the perfect pH balance. AUTOMATIC TEMPERATURE COMPENSATION - The kit Automatic digital pH meter has an automatic temperature compensation feature that adjusts to water temperatures and water quality to give pH readings almost instantly . WIDE USE-PH meter for water with high quality glass pH probe, suitable for a wide range of applications, suitable for testing the ph balance of drinking water, swimming pool, aquarium, Ro system, spa, hydroponics, food,