I use a tub and rack system, so I place mine in the front of the tub. I use a temp gun to monitor the warm spot in the back. I use the Acu-rite to give me a basic air temp and humidity level. Basically, if I can do a quick look and see that my humidity and air temp in the front (cool end) of the tub are good, then I can be pretty certain that things in the back of the tub are ok.
It looks like this:
EDIT: This photo was taken when I was stationed in Virginia. Now that I'm back in Florida where the humidity is higher, I use a much smaller water bowl.