Multifunctional Digital Water Quality Tester IP65 Waterproof ORP CL₂ H₂ Temp 4 In 1 High Accuracy Water Quality Test Pen Meter Item Type: Water Quality Tester Detection Range: ORP, CL₂, H₂, Temperature Material: ABS Length: Approx. 186mm/7.3in Gross Weight: 130g/4.6oz Applicable Industries: Swimming Pools, Hot Springs SPA Places, Water Plant Laboratory, Aquaculture Industry, Food Processing Plants, Other Battery (Shipped Without Battery): 3 x LR44 Button Cell Batteries Waterproof Grade: IP65 Working Environment: 0‑60℃(32.0‑140.0℉), RH:100% Backlight: LCD Backlit Display Automation Off: 5 Minutes Display Mode: LCD Digital Display Calibration Mode: Automatic Calibration ORP: Measuring Range: ±1999mV Resolution: 1mV Accuracy: ±2mV H₂ (Hydrogen Rich): Measuring Range: 0‑10000ppb (0.001‑10.000ppb) Resolution: 2ppb (0.002ppb) Accuracy: ±10ppb, (±0.01ppb) Temperature Compensation: (0~60)℃ (automatic) CL₂: Measuring Range: 0.01~4.00ppm (Total Residual Chlorine) Resolution: 0.01ppm Accuracy: ±10% of Reading Value, ±0.01ppm Temperature Compensation: (0~60)℃ (automatic) TEMP (Temperature): Measuring Range: 0‑60℃ Resolution: 0.1℃ Accuracy: ±0.1℃