PINPOINT ORP (REDOX) Controller is an inexpensive rugged controller complete with a platinum ORP probe. This device will automate another electrical device like an ozonizer or ozone generation unit within a range selected by the user. This full feature controller will accommodate an electrical device up to and including 5 full amps. Comes complete with probe. The PINPOINT ORP Controller™ is the perfect way to automate ozone in the aquarium. 110 VAC operation. Never needs calibration.