That cooking thermometer won't give you an accurate reading either. Here's the one you need: http://www.amazon.com/Chaney-Instruments-Acu-Rite-Thermometer-Humidity/dp/B001BO8CUE/ref=sr_1_38?s=home-garden&ie=UTF8&qid=1294772226&sr=1-38 It's very important that you find out what the true temps are. He shouldn't be spending a lot of time in his hide, he should be wanting to bask.
How old is your beardie by the way?
How old is your beardie by the way?