1. Product description: PH tester electronic watch Bluetooth 7-in-1, ATC water quality tester / PH / TDS / EC / ORP / SG (accuracy 0.01), auto-calibration. This pH meter is designed in a 7-in-1 size and can measure the quality of liquids such as drinking water, aquariums, swimming pools, spas, and well water. Whether indoors or on vacation, it ensures the safety of daily domestic water. Comprehensive water quality measurement ensures healthy water quality. 2. 【Accurate measurement】pH range: 0.00 - 14.00; resolution: 0.01 pH; accuracy: ±0.05 pH; EC range: 0 - 9990 μs/cm; TDS range: 1 - 9990 ppm; resolution: 1 ppm; accuracy: ±2% FS), with fast and reliable readings. 3. 【Intelligent design】Supports mobile phone control of the backlight. The mobile phone can display calibration records. Supports accurate on - site testing. Supports Excel table printing (via Bluetooth). The APP is available in both English and Chinese for you to choose from. 4. 【Easy to use】After calibration, simply place the sensor in the test solution to obtain data immediately. Before the next test, please thoroughly clean the probe. Otherwise, the readings may be incorrect. Learn how to clean and test water to make your life healthier. 5. 【Wide application】It is very suitable for pH testing in households and laboratories, including drinking water, swimming pools, ponds, breweries, kombucha, aquariums, hydroponics, laboratories, food processing, etc.