With this temperature control device (controller) heating elements up to 1000 W connected load can be operated. The temperature sensor (seawater-proof) is hung near the heater in the aquarium water. The heater must be connected to the temperature controller.
It is also possible to create double safety with this controller by connecting a control heater to this device. If one of the two regulations fails, it is granted that the other regulation can still switch off and prevents a too high temperature.