The water quality detector is an instrument specifically designed for detecting water quality. This water quality detector can measure three water quality indicators and achieve comprehensive evaluation of water quality. ●Range: ORP:-1000mv-+1000mv :0.01-3.0mg/L Temp:0°C-50°C(32°F-122°F) ●Resolution: ORP:1mv :0.01mg/L Temp:0.1C (0.2°F) ●Accuracy: ORP ±5mv Temp:±1.0°C ●Battery:2x3V(CR2032)--Not Include Battery. ●Auto Shutdown: 8MiN (automatically switch off the backlight if there is no key operation in 2 minutes. Pressing any key on the instrument turn the backlight on.) ●Temperature Compensation:0°C~50°C ●Operating Temperature:0°C~50°C Color: Blue Material: plastic Package Contents: 1 x 3 in 1 Tester 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.