AT-Control can measure and control pH, ORP (Redox potential), temperature, conductivity, water level and can manage numerous timed circuits such as lighting and dosing. Programming and control can also be managed using a PC via a USB connection. The system is modular in nature so that it can be expanded from a basic module to a complete control unit capable of managing several aquariums. All the modules are interconnected via USB ports so the data can be downloaded to a PC and shown graphically.