Okay thanks for the info. Then I'm assuming that I should use the IR temp gun and measure the temp from the GLASS on the inside of the tank, not over the substrate, as it is possible for the snake to get under the paper if he so chooses. Am I correct in thinking this way? If the glass above the UTH is 90 degrees, but the 'hot spot' on top of the substrate is only 84, should I leave the thermostat at that setting because the glass is reaching 90 degrees and this is a place the snake can get?

Thanks again,
Kourtney