Send back that gauge. The are very inaccurate. I will say again order the acurite 00891 and it will give you a probe for hot side under substrate on top of glass over heat mat and then you can use the whole unit on cool side for cool side temp and humidity. If your worrying about ruining the uth by pealing it off then just gently peal it back and push the thermostat probe in and then press firmly to sandwich it and then take foil tape and tape the uth to the bottom of the tank. I have pealed back and moved several zoo med uth with no problem, some more than once but I always foil tape them down bc after awhile they will peal off on there own.
This is a picture of my test setup for my toffino enchi I'm getting in 2 weeks. The thermometer in the back right is the acurite 00891 and you can see the probe wire running to the left, I will bury the wire before the snake goes in, the acurite is giving me the probe reading 90.5 (hot side) 81.1 cool side and 36% humidity ( will bring humidity to proper spot once snake is in). This thermometer is what you should get, you will have very accurate readings, I have tested them and own 11.
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