Yes, heat pad is controlled by thermostat! The hot side (where her hide is) is always between 27 - 31 Celsius and ambient temp ranges from 80 - 84 (thought I have to keep the lamp on all the time to keep the ambient temp up).
I use paper towel for the substrate. It dries very quickly after misting.
I'll go to Walmart this weekend and get the gauge you recommended for sure. Is "Accurite" the brand? I have a regular digital thermometer measuring the ambient heat and a thermostat connected to the heat pad measuring/controlling THAT temperature.
I know not to handle her at least 48 hours after feeding, and I will keep the handling to a serious minimum when I move her into her new home on Sunday.