Waterproof class: IP65 Working environment: 0-60°C(32.0-140.0°F) RH: 100% Backlight: LCD screen backlit display Automatic shutdown: Five minutes Electric cell: 3*1.5V(LR44) (Not included)<br><br>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: 0~60℃(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℃ Colour:Red Material:plastic<br><br>Package Contents: 1 x Chlorine Testing Pen 5-in-1<br><br>Only 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.