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5 In 1 Chlorine Meter PH Meters ORP H2 Temp Cl2 Detector Water Quality Monitor Test Tool Filter for Swimming Pool SPA Water Please note: Due to the straightforward volatilization of chlorine, when your measurement result is 0, it would not imply that the software is not working You can measure the Cl2 in faucet water: turn on the faucet, let the water circulate for 10 seconds, then take a water sample and test instantly Please note: Choose the model in keeping with your wishes 2 in 1: For Cl2, Temp; 3 in 1: For Cl2, H2, Temp; 4 in 1: For Cl2, H2, ORP, Temp five in 1: For Cl2, H2, ORP, PH, Temp Specifications: pH Measuring range: 0~14 Resolution: zero pH Accuracy: ±0 Temperature compensation: 0~60℃(Auto) ORP Measuring range: ±1999mV Resolution: 1mV Accuracy: ±2mV CL2 Measuring range: 0~4 (Total residual chlorine) Resolution: 0 Accuracy: ±10% reading value, ±0 Temperature compensation: 0~60℃(Auto) H2 Measuring range: 0~10000ppb (0~10) Resolution: 2ppb (0) Accuracy: ±10ppb (±0) Temperature compensation: 0~60℃(Auto) TEMP Measuring range: 0~60℃ Resolution: 0℃ Accuracy: ±0℃ Waterproof class: IP65 Working environment: 0-60°C(32°F) RH: 100 percent Backlight: LCD display screen backlit demonstrate Automatic shutdown: Five minutes Electric cell: 3*1(LR44) (Not included) Screen size: 28*20mm Display mode: Liquid crystaldigital display Notes: The electrodes needto be wiped clean after use five in 1: Cl2, H2, ORP, PH, Temp four in 1: Cl2, H2, ORP, Temp three in 1: Cl2, H2, Temp; 2 in 1: Cl2, Temp;