Fangrui Product Details Waterproof Class: Ip65 Working Environment: 0-60c(32.0-140.0f) Rh: Backlight: Lcd Screen Backlit Display Automatic Shutdown: Five Minutes Electric Cell: 3*1.5v(lr44) (not Included) Screen Size: 28x20mm Display Mode: Liquid Crystaldigital Display Notes: The Electrodes Needto Be Cleaned After Use Ph Measuring Range: 0~14.00ph Resolution: 0.01 Ph Accuracy: 0.01ph Temperature Compensation: 0~60auto) Orp Measuring Range: 1999mv Resolution: 1mv Accuracy: 2mv Cl2 Measuring Range: 0.01~4.00ppm (total Residual Chlorine) Resolution: 0.01ppm Accuracy: Reading Value, 0.01ppm Temperature Compensation: 0~60auto) H2 Measuring Range: 0~10000ppb (0.001~10.000ppb) Resolution: 2ppb (0.002ppb) Accuracy: 10ppb (0.01ppb) Temperature Compensation: 0~60auto) Temp Measuring Range: 0~60resolution: 0.1accuracy: 0.1colour:red Material:plastic Package Contents: 1 X Chlorine Testing Pen 5-in-1 Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And D