A device for measuring pH, mV, and ORP from the Barnant 20 model. eBay eBay +1 Uses: This portable device is used to measure the acidity and alkalinity level in liquids, in addition to measuring oxidation-reduction potentials. Features: The device usually comes in a kit containing a measuring probe and a digital display for clear reading. Operation: The device is powered by a 9-volt battery and features the ability to calibrate the device on-site to ensure accurate measurements. eBay eBay +4 Price 300 riyals. Serious and final buyers please contact me privately. The device is as shown in the offer.