ORP-200 Waterproof ORP Meter

Oxidation reduction potential (also known as redox potential, oxidation / oxidation potential, or ORP) is a measure of water's ability to gain or lose electrons in chemical reactions. Just as the transfer of hydrogen ions in water determines the pH level, the transfer of electrons in water determines the ORP value. Specifications: Measures oxidation reduction potential (redox) and temperature Auto-ranging calibration with digital fine tuning Includes 4 pH buffer solution in a sponge embedded in a clear cap, so you can see if it's dried up Waterproof housing Simultaneous temperature display Measurement range: -999 to +1000 mV Digital calibration (push button) Auto-off function, data-hold function and low-battery indicator. Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Factory calibrated: the ORP-200 meter is factory calibrated to +200 mV. The meter can be easily recalibrated with digital calibration using the push buttons, rather than a screwdriv