That looks pretty cool. At $49 it beats my planned selection. A Ranco Model etc211000000 @ $119.
This is the one that is 2 stage. It will control heat and cooling that way you can have the carboy in the mini fridge to control the cooling side and a heating pad wrapped around the carboy to control the heating portion. You can also buy it cheaper unwired but you will spend just as much $ buying the cords yourself. Then you have to figure out how to wire it.
So, all you need is the Mini Fridge.