【Accurate and Reliable】 The PH value meter features reliable Automatic Temperature Compensation (ATC) to ensure accurate readings at different temperatures. To achieve high accuracy, the pH tester has a sensitive electrode sensor, measuring range: 0.00-14.00 pH, accuracy: ± 0.01 pH. The TDS meter is equipped with a high quality titanium alloy probe, measuring range: 0-9990ppm, accuracy: ± 2%. 【LCD display】 The portable pH meters have a backlit display that allows you to more accurately read your water quality results. It is easy to use even in dark environments. 【Wide applications】 Water quality testers are suitable for multiple occasions, such as drinking water, wine, juices, aquariums, hydroponics, spas, swimming pools and other water systems to ensure the safety of your daily life water.