Product review (5 stars): Works Amazingly, this is going to be some GREAT BEER!
I placed the Temp Controller in the fridge at my recommended 64 degree fermenting temperature and checked it the next morning and the fridge was at 64.8 degrees (checked with digital thermometer). The fridge doesn't run often as long as you don't open the door too often. The 3.5 degree differential is great because it saves my compressor. I have only tested the device to prepare for brewing this weekend... but i'm thinking i'm going to have some of the best tasting beer to date! I recommend this product, just do be careful with the copper coil because it is fragile.