I dont think I can get any smaller than the 4oz ramekin dishes, which are on the cool side of the tub. I have put lots of vent holes on all sides, and I still get condensation on the front of the tubs.. I do have 1 accurite in a middle tub which either reads in the 80's or hi. how about the flukers digital without a probe, would that work for each individual tub to give me at a glance readings of humidity in each tub? I am curious as to the humidity varies from tub to tub. thanx for the reply. I was starting to get a complex.