1 - High Accuracy - PH tester digital has high precision pH accuracy, which can test quickly and accurately within 0.01 pH. It only takes a few seconds to show accurate and stable reading. 2 - Easy to Calibrate & Use - Press CAL for 5 seconds to enter the calibration mode, select the powders corresponding to 6.86/4/9.18 to complete the calibration. The pH value of any solution can be tested by just immersing the probe of the pH meter. 3 - Wide Applications - General-purpose pH tester, professionally used for pH test of various liquids. pH meter could be used to test drinking water, swimming pools, pH balance in aquarium, RO system, spa or hydroponics. All the environments that need to test pH value can use this tester to get accurate data. 4 - Family Essentials - PH meter for water as a tool to improve the quality of life, bring you healthy drinking water, fruit juice, chili sauce, seasoning sauce. At the same time, if you have aquatic pets, the pH tester is also a perfect tool to ensure the safety of the pet"s water source. 5 - Automatic Temperature Compensation - No more need to take care about the temperature of testing liquid,as the pH Meter Has an Auto Temperature Compensation Feature That Adjusts to Water Temperatures and Water Quality.