Water Quality Tester 3 in 1 Hydrogen CL Temperature IP65 Waterproof LCD Backlit Water Quality Meter for Drinking Water Pool Item Type: Water Quality Tester Material: ABS Weight: Approx. 131.00g/4.62oz Detection Range: Hydrogen, CL, Temperature Applicable Industries: Swimming Pools, Hot Springs, Water Plant Laboratories, Aquaculture Industry, Food Processing Plants, Others Size: Approx. 186mm/7.3in Battery: LR44 Battery x3 (Not Included) Waterproof Level: IP65 Operating Environment: 0 to 60°C (32.0 to 140.0°F) RH: Full Backlight: LCD Backlit Display Auto Power Off: 5 Minutes Display Mode: LCD Digital Display Calibration Way: Auto Calibration H₂ (Hydrogen): Measuring Range: 0 to 10000ppb (0.001 to 10.000ppb) Resolution: 2ppb (0.002ppb) Accuracy: ±10ppb, (±0.01ppb) Temperature Compensation: (0 to 60)℃ (Automatic) CL₂ (Cl): Measuring Range: 0.01 to 4.00ppm (Total Cl) Resolution: 0.01ppm Accuracy: ±10% of Reading, ±0.01ppm Temperature Compensation: (0 to 60)℃ (Automatic) TEMP (Temperature): Measuring Range: 0 to 60℃ Resolution: 0.1℃ Accuracy: ±0.1℃