Pinpoint ORP Monitor by American Marine. **** PRODUCT MANUAL **** PINPOINT ORP Monitor™ will measure the ORP (oxidation-reduction potential, or REDOX) of your system. It is popular with those who use ozone gas or potassium permanganate as an artificial oxidation agent in fresh or saltwater. It is also popular for measurement of hydrogen rich water. Constant monitoring of the ORP is useful in keeping tabs on the overall health of a system, as a drop in ORP often precedes visual or other indications of trouble. This unit features a 1mV digital resolution and a platinum sensor electrode. This is a full range REDOX/ORP instrument (–2000 to +2000 mV) * Given proper care, the PINPOINT ORP Monitor™ should last a lifetime. * PINPOINT ORP Probe comes with a 10 foot high supression cable and a BNC connector. * The range is –2000 to +2000 mV. * Powered by a standard 9-volt battery (not included).