I have been happy with the following thermometer/hydrometer. I found it recommended several times in this forum. It will measure both humidity/temperature at the unit itself and a secondary temperature by a connected probe. I use one on each my warm side and cool side of cage.
http://www.walmart.com/ip/Acu-Rite-I...mometer/896347
Check out the care sheets here in the forum for more info also. Some great info there.
Do you have a thermastat for your heat source?
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