Five-in-one Multifunction- This digital pH meter features a five-in-one design and can test pH, TDS (Total Dissolved Solids), electrical conductivity, salinity and water temperature. Measuring range: pH 0.00-14.00 (accuracy: 0.01 pH), TDS 0-10,000 ppm, 10.1-200.00 ppt, electrical conductivity 0-10,000 S/cm, 10.1-19.99 mS, 20.1-400.0 mS/cm, salinity 0.01%-25.00% and temperature 0-60C. Waterproof rating: IP67. High-precision pH tester: The glass probe of this pH tester features a low-resistance (25 M) glass-sensitive membrane with a response time of 0.1 seconds. The TDS electrode is made of high-quality, flexible titanium alloy, providing excellent corrosion resistance. The pH meter uses a three-point calibration method to calibrate the electrode to a pH solution of 4.01/6.86/9.18 to ensure measurement accuracy. Green backlit LCD display: This pH meter features a bright green backlit LCD display for intuitive information display. Even in low visibility, the digital display remains clear. Its pocket-sized design makes it easy to carry. The 5-minute auto-off feature saves energy and extends battery life. Automatic Temperature Compensation & Calibration- The temperature of the liquid will affect the reading, but our digital pH water quality tester can accurately measure the pH value of samples within a temperature range of 0C to 60C / 32 to 140F, and the pH tester can automatically identify the calibration solution and read the numerical value at a glance.Wide Application- This 5-in-1 multifunctional pH tester is ideal for home and laboratory pH testing applications, and can be used to test the quality of drinking water, swimming pools, aquariums, spas, aquaculture, ponds and well water indoors or on vacation to ensure daily water safety.