Feature 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 MeterMaterial: PlasticColor: As shown in the pictureORP Measuring Range: -1999~1999 mVTemperature 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 / 5.6ozHow 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. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x ORP Meter(Battery Not Included)1 x Instruction Manual1 x Screwdriver1 x Protective CaseNoteMonitors 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.