Features 1、6 in 1 Water Quality Tester: The TDS meter adopts 6 in 1 functional design and can measure pH, EC, TDS, SALT, S.G and temperature. Meet all your testing needs and comprehensively test water quality. 2、Automatic Calibration: Using a highly sensitive glass probe, it can obtain a full measurement range of 0‑14 pH and a 0.01 pH resolution. The pH meter uses a 3 point calibration to calibrate the electrodes to solutions with pH 4.00, pH 6.86, and pH 9.18, which are not included. You can easily calibrate to ensure measurement accuracy. 3、Easy to Operate: Simply immerse the electrode in the target solution, then hold down the TEMP CAL button after the reading stabilizes, usually 5‑10 seconds, and the pH meter will automatically calibrate. 4、Auto Temperature Compensation: The water quality tester can accurately measure the pH value of the sample within the temperature range of 0 ℃ to 50 ℃, thereby solving the inaccuracy caused by changing the liquid temperature. 5、Wide Application: Widely used in hydroponic systems, drinking water, tap water, beer, wine, tea, milk, home brewing, swimming pools, aquariums, hot tubs, aquaculture, spa centers, fish tanks, and urine. Specification Item Type: Water Quality Tester Model: Bluetooth 786 Material: ABS Battery: 4 x 1.5V LR44 button battery, shipped without battery. Temperature Compensation: 0℃~50℃ Working Temperature: 0℃~50℃ Range: PH: 0.00-14.00pH EC: 0-19900us/cm, 0-199.0ms/cm TDS: 0-19900ppm, 0-199.0ppt SALT: 0-199.0ppt, 0% -20% S.G: 0.990-1.400 Temp: 0℃-50℃, that is, 32℉-122℉ Resolution: PH: 0.01PH EC: 1us/cm (<1999us/cm), 10us/cm (>1999us/cm), 0.1ms/cm TDS: 1ppm (<1999ppm), 10ppm (>1999ppm), 0.1 ppt SALT: 1ppm (<1999ppm), 10ppm (>1999ppm), 0.1ppt, 0.01% S. G: 0.001 Temp: 0.1℃, that is, 0.2℉. Accuracy: PH: ± 0.03pH EC, TDS, SALT: +2% F.S Temperature: ± 1.0 ℃ Package List 1 x Water Quality Tester 1 x User Manual