You definitely need to get a probe thermometer. You can pick them up anywhere that sells BBQ equiptment if you just wanna grab a cheap one. You stick the probe into the substrate and it will give you an accurate idea of how warm it is. Think of it this way... your thermometers right now are on the side of the tank taking the temp of the air. You snake isn't usually in the air, his belly is down on the substrate where he curls up. You wanna know what the temp is there. The uth can get very hot, that won't show up on the thermos you have on the wall. So you need to measure the heat in the substrate. Also pick up a light dimmer, it plugs into the socket, then you plug the uth into it. You can then dim the power supply going to the uth so it does not get too hot. You can monitor that once you get the probe thermo.
Hope that helps!!!
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