【Multifunctional Testing】This 5-in-1 pH meter tests pH, TDS, EC, salinity, and temperature of liquids, offering comprehensive water quality analysis in one device. 【ATC Function & Easy Calibration】Equipped with automatic temperature compensation (ATC), the meter ensures accurate readings across different temperatures. Calibration is easy with the included mini slotted screwdriver. 【High Precision Probe】The pH meter features a high-precision probe that delivers accurate measurements, helping you maintain optimal water quality for your health and well-being. 【Durable and Lightweight】Designed with a lightweight ABS material, this pen-type tester is both durable and easy to use, providing convenience for everyday water testing. 【Waterproof Design】The battery compartment is well sealed with a silicone ring, this tester is fully waterproof, allowing you to soak it in water without worry during testing. 【Versatile Application】Perfect for a wide range of applications, including testing the water quality of drinking water, swimming pools, farmland irrigation, fish tanks, and more. Specifications: Material: ABS Automatic Temperature Compensation: 0~50℃ Operating Temperature: 0~50℃ pH Calibration: 2 points (4.01,6.86), or 1 point (6.86) calibration Auto-off: After 8 minutes Power Supply: 3 * 1.5V LR44 AG13 button battery (NOT included) Item Size: 188 * 38mm / 7.40 * 1.50in Item Weight: 83g / 2.94oz Range: pH: 0.0~14.0pH EC: 0~1999μs/cm, 0~19.9mS/cm TDS: 0~1999ppm, 0~19.9ppt Salinity: 0~42.0‰ Temperature: 0~50℃ Resolution: pH: 0.01pH EC: 1μs/cm (<1999μs/cm), 10us/cm (>1999 us/cm) 0.1mS/cm TDS: 1ppm (<1999ppm), 10ppm (>1999ppm) 0.1ppt Salinity: 0.1‰ Temperature: 0.1℃ Accuracy: pH: ±0.1pH EC: ±2%F.S TDS: ±2%F.S Salinity: ±2%F.S Temperature: ±0.5℃