i have 2 of the accurites that i ordered online, i have one on the hot side under the substrate and 1 on the cool side that is barely just covered by substrate, then i get the humidity level on both sides of the tank, which is within 3-4 percent of each other, of course it is a 40 breeder instead of the 20 long..
here is the link to the amazon place where i bought mine,
https://www.amazon.com/Instruments-A...ter+with+Humid