I got an awesome indoor/outdoor thermometer from WalMart, it's called an AcuRite thermometer. It has a probe so I can test the temps on the warm side/in the hide AND on the cool side at the same time. Bang! I see 95, 73, and 50%! 2 temps and humidity! How cool is that!
Plus, it costs $12.... I mean, that is not bad at all, considering it's a working electronic.