The Milwaukee MC125 PRO pH/ORP controller is designed to measure and automatically adjust both pH and ORP levels in saltwater aquariums, ensuring optimal water conditions for marine life. With an accuracy of ±0.2 pH and ±5 mV for ORP measurements, this digital controller provides reliable real-time monitoring across a wide range from 0.00 to 14.00 pH and -1000 to 1000 mV. It features two dedicated relays that can control various devices such as oxygen pumps or CO2 regulators, making it easy to maintain the desired water parameters with minimal manual intervention. This product is ideal for experienced reef aquarium hobbyists who require precise and automated pH and ORP management in their tanks.