1The casing of this instrument is designed in waterproof, and the waterproof grade is IP65. The electrode of the product is a replaceable head, which is easy to use. 2With data lock function, and temperature (/) display function, it is convenient to save and record the measurement data. 3Easy to use, high stability, pocket size, lightweight and portable, easy to carry, no need for frequent adjustments. 4Apply in drinking water, swimming pool, fish tank, aquaculture, irrigation, laboratory and other water systems. 5Use to measure the amount of Oxidation Reduction Potential (ORP) level and temperature (C/ F). Item Type: ORP Meter Material: Plastic Color: As shown in the picture ORP Measuring Range: -1999~1999 mV Temperature Range: -50~70C (-58~ 158F) Accuracy: 5mV 1 (2) Resolution: 1mV; 0.1 (0.2) Working Environment: 0-50C (32-122F) Battery: 4 x 1.5V AG-13 button battery (not included) Weight: Approx. 160g / 5.6oz How to Use: Install the battery, open the cover and put the measuring head into the liquid to be measured, and the value can be displayed in a moment. 1 x ORP Meter(Battery Not Included) 1 x Instruction Manual 1 x Screwdriver 1 x Protective Case Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.