PH/CL2/H2/ORP/Temperature Meter Chlorine Detector Digital 5 In 1 Water Quality Tester for Swimming Pools Drinking Water Aquarium 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: Choose the model according to your needs 2 in 1: For Cl2, Temp; 3 in 1: For Cl2, H2, Temp; 4 in 1: For Cl2, H2, ORP, Temp 5 in 1: For Cl2, H2, ORP, PH, Temp Specifications: pH Measuring range: 0~14.00pH Resolution: 0.01 pH Accuracy: 0.01pH Temperature compensation: 0~60(Auto) ORP Measuring range: 1999mV Resolution: 1mV Accuracy: 2mV CL2 Measuring range: 0.01~4.00ppm (Total residual chlorine) Resolution: 0.01ppm Accuracy: 10% reading value, 0.01ppm Temperature compensation: 0~60(Auto) H2 Measuring range: 0~10000ppb (0.001~10.000ppb) Resolution: 2ppb (0.002ppb) Accuracy: 10ppb (0.01ppb) Temperature compensation: 0~60(Auto) TEMP Measuring range: 0~60 Resolution: 0.1 Accuracy: 0.1 Waterproof class: IP65 Working environment: 0-60C(32.0-140.0F) RH: 100% Backlight: LCD screen backlit display Automatic shutdown: Five minutes Electric cell: 3*1.5V(LR44) (Not included) Screen size: 28*20mm Display mode: Liquid crystaldigital display Notes: The electrodes need to be cleaned after use 5 in 1: Cl2, H2, ORP, PH, Temp 4 in 1: Cl2, H2, ORP, Temp 3 in 1: Cl2, H2, Temp; 2 in 1: Cl2, Temp;