1Used to measure the oxidation reduction potential (ORP) level and temperature (C / F). 2Dual function, can measure the ORP and temperature. 3Compact and portable pen design,easy to operate and storage. 4Waterproof rating IP65, replaceable sensor probe. 5Large and clear LCD with backlight, easy to read and accurately measuring functions. Description: The water quality monitor is the useful tool for testing PH/EC/TEMP of solution level. It looks like a pen, the portable size is good for carrying. Suitable for water sources, aquarium, hydroponics, laboratory and scientific testing, spas, swimming pools and other water systems. Feature: Used to measure the oxidation reduction potential (ORP) level and temperature (C / F). Dual function, can measure the ORP and temperature. Compact and portable pen design,easy to operate and storage. Waterproof rating IP65, replaceable sensor probe. Large and clear LCD with backlight, easy to read and accurately measuring functions. Suitable for water sources, aquariums, hydroponics, spas, swimming pools and other water systems. Speciation: Range: - 1999mv ~ 1999mv Temperature range: (70 - 58 F ~ 158 F) Resolution: 1mV 0.11C (0.2F) Accuracy: 5mv; 1C (2F) Operating temperature: 0 C ~ 50 C (32 F ~ 122 F) Battery: 4 x 1.5v (ag-13) button battery (Not included the battery) Material: ABS Color: Yellow Size: 190 x 37 mm / 7.48 x 1.46 inch (appr.) Screw driver length: 95 mm / 3.74 inch (appr.) Package included: 1 x ORP/TEMP Meter 1 x Screw Driver 1 x Manual