The acurite should have a probe, I put mine under the substrate on the glass that's over the "hot spot" or UTH. Then I set the unit over on the cool side on the floor. Since heat rises, you don't want it up high, but rather on the floor where your snake spends most of its time. It should give you two temp reads and a humidity read if it's the one I'm thinking of.
Glad ad you found a hide he likes, now get another one.You should have two, a lot of people put one over the UTH and one on the cool side.
To me, and I'm definitely not an expert on this, four degrees of temp difference doesn't seem like much. Especially when you take into consideration that substrate is thicker in some places than others, may be more wet etc. Again, not an expert on that though.
if you're a visual learner this is a nice "tutorial" for tub setups. http://ball-pythons.net/forums/showt...e-Basics-*DUW*