MasterShake
Well-Known Member
do what I am going to do and brew a Saison 
Stupid question - when you take the temp readings are you going on the water in the outside container? That would be easiest since you don't have to dip into the carboy, but wouldn't the beer be warmer than that? Or is it just close enough to get an idea of the temp?
Water is a great thermal engine. Air chambers (fridge) must be 60-ish for the beer to maintain 67-68, but immersed in a tub of water, the temp of the beer is very close. If you put a $20 pond pump in the bottom to keep it all moving about, they'd probably be within half a degree.