I've got mine attached to a piece of syrofoam - that's attached to a pet bottle full of water that sits on the hump. It would probably be more accurate if the styrofoam was attached to the top of the keg (not the side) but I couldn't be stuffed re-attaching each time a keg is emptied. I adjust the fridgemate to 2 degrees lower than serving temp and it seems to work fine. Don't forget to use a pc fan to move the air around a bit or you may get some bigger temp differentials between top of keg and bottom (or so I'm told).
On my fermenter i didn't use the styrofoam on the fridge side and the tempmate swings much more wildly when the door is opened so I'll be fixing that soon.
On my fermenter i didn't use the styrofoam on the fridge side and the tempmate swings much more wildly when the door is opened so I'll be fixing that soon.