Description: ORP-969 Pen-Type ORP Meter Drinking Water Quality Analysis Device Oxidation Reduction Industry Analyzer Redox Meter The pen ORP meter is professional and ideal tool for testing your water level. Suitable for aquarium pool and environment water. Features: Use to measure the amount of Oxidation Reduction Potential (ORP) level. The tendency of the solution to either gain or lose electrons. Clear LCD with backlight. Apply in water sources, aquarium, hydroponics, spas, swimming pools and other water systems. Mini small size, easy to carry with. Compact and portable pen-type design. Easy to use and provides instant display of results. Specifications: Range: -1999mV ~ 1999mV Resolution: 1mV Accuracy: ±5mV Operating Temperature: 0 ~ 50 Degree (32 F ~ 122 F) Battery: 2 × 3V(CR1632) Button Cell Battery Color: Yellow Material: ABS Item Size: 14.8 x 2.6 x 1.4cm \/ 5.8 x 1.0 x 0.6in Item Weight: 37.4g \/ 1.3oz Package Size: 17.8 x 7 x 3cm \/ 7 x 2.8 x 1.2in Package Weight: 94g \/ 3.3oz Package includes: 1 x ORP-969 Pen-Type ORP Meter 1 x User Manual 1 x Mini Screwdriver Details pictures: