Or, theres a post that shows you how to mod it so that the inside temp and the humidity sensors are on wires too. So you can put one lead on the hot side and one on the cool side and hang the humidity one any where in there, and the thermometer can stay out of the tub/tank. I do that with mine and works great!
Here is the link!
http://ball-pythons.net/forums/showt...erm-Hydgro-Mod