Waterproof class: IP65Working environment: 0-60C(32.0-140.0F) RH: Backlight: LCD screen backlit displayAutomatic shutdown: Five minutesElectric cell: 3*1.5V(LR44) (Not included)Screen size: 28x20mmDisplay mode: Liquid crystaldigital displayNotes: The electrodes needto be cleaned after usepHMeasuring range: 0~14.00pHResolution: 0.01 pHAccuracy: 0.01pHTemperature compensation: 0~60(Auto)ORPMeasuring range: 1999mVResolution: 1mVAccuracy: 2mVCL2Measuring range: 0.01~4.00ppm (Total residual chlorine)Resolution: 0.01ppmAccuracy: 10% reading value, 0.01ppmTemperature compensation: 0~60(Auto)H2Measuring range: 0~10000ppb (0.001~10.000ppb)Resolution: 2ppb (0.002ppb)Accuracy: 10ppb (0.01ppb)Temperature compensation: 0~60(Auto)TEMPMeasuring range: 0~60Resolution: 0.1Accuracy: 0.1Colour:RedMaterial:plasticPackage Contents:1 x Chlorine Testing Pen 5-in-1Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +- 1-3cm.