The Neptune Systems A3 Apex Pro Aquarium Controller is an advanced system designed to monitor and control various aspects of your saltwater or freshwater aquarium, including temperature, pH levels, ORP, and salinity. This robust controller features a built-in audible alarm, WiFi compatibility, and multiple ports for connecting various sensors and devices. The included extra Energy Bar 832 power module offers an additional eight controllable outlets along with specialized outputs designed for water pumps, dosing systems, and other accessories. It comes equipped with lab-grade double-junction probes for accurate monitoring of key parameters and includes new liquid level and optical leak detection sensors to ensure your aquarium's safety. The A3 Apex Pro is ideal for experienced aquarists looking for a comprehensive system that offers detailed control over their aquatic environment.