The Aqua Medic Temperature monitor and controller: T controller is available in 2 versions:
T controller HC for the control of heating systems and T controller CC for the control of cooling units.
The control range varies from 0 to 50 deg C, with a precision of plus or minus 0.1 deg C. The maximum load is 1000 watts for heaters and 600 watts for coolers. The results are displayed on the easy to read LED screen.
The units are supplied with a waterproof temperature probe.
Aqua Medic also have a T Computer which can monitor the temperature of both heaters and chillers. It gives precise results that you can rely on.