Well said PitOnTheProwl.. was going to type that lastnight but eh hate posting off iphone, I would like to add some thermostat probes are pretty big and no very convenient to put between the glass and the mat, when I came across this i put the probe on the back side of the mat and dialed in the temp with a temp gun and also always had a probe on it. But when a snake pees or poops on the probes just on my accurite ones there is a 2-3 degree difference just in that reading alone, so normally its 90-91 and when they to there stuff on it I get a reading of 86-89 and if this was a thermostat probe my uth would just keep heating untill it was the 92 degrees its set at, also good reminder that he has done it...