The STC-1000 is a temperature controller you can use to control your fermentation temperature. It has a hot and a cool circuit which you can use to heat and ferment your wort depending on the setting of your controller. This is a bare bones controller, and you need to assemble the controller yourself.
The easiest way to do this is to buy two cheap extension leads which you can use for all wiring and plugs/sockets, and then assemble into any suitable housing such as a Systema box.
There are lots of easy to follow wiring videos available on Youtube and we recommend this one here.
