This ORP controller is designed to monitor and control oxidation/reduction potential (ORP) levels in aquariums and small recirculating systems. The controller has a 5-amp relay output to regulate ozone production by turning an ozone generator on/off. The controller includes an ORP probe w/10” cable and 5” power cord. 115V/60HZ. One-year warranty on the meter, 6-month on the probe.