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This handy ORP tester measure the amount of Oxidation Reduction Potential (mV) from -1999~1999mV. It has clear LCD with backlight function for convenient opearation even in dark areas. Oxidation Reduction Potential (ORP) was found to be a reliable indicator of bacteriological water quality. Features: It has protective cap that helps reduce contamination Clear LCD with backlight function Provides instant display of measured value Compact pensize and light weight for mobility With CE RoHS Marking, passed & comply with all the necessary health and safety required standards set by the European Directives Specifications: Range: -1999~1999mV Resolution: 1mV Accuracy: ±5mV LCD Display : 4 Digits Battery: 4 x 1.5V (AG-13) Operating Temperature: 0~50°C Calibration : manual by mini screwdriver (included) Item Color: Red Weight: 53g Set Includes: 1 x Digital Pentype ORP Meter4 x 1.5V (AG-13) Battery (Installed)1 x Mini screwdriver / trimmer1 x Casing English Instruction Manual