This little meter offers ORP data at a very affordable price. Detachable probe with 10’ cable use BNC connector and is accurate to 1 mV. Epoxy covered electrode with a platinum band and silver/ silver chloride (Ag/AgCl) tip. For calibration, it has an easy to use offset screw. Liquid crystal display. Powered by single 9 V battery (included). Can be used in both fresh and saltwater. Six month warranty. Probe included. Calibration solutions sold separately.