Testing UTH stupid question.

[M3chan1ca1]

I have a ball python in a 40 gallon glass tank, and Im having heat/humidity issues.

Im switching around CHE and a zoo med UTH.
I think I've almost got the heat narrowed down.
Useing UTH on basking side and CHE on cool side.

My question is, how should I measure the UTH?
Should I put the thermometer probe on top of the substrate (in my case Im using repti-bark). Or should I put the probe on the bottom of the tank?

Its 106 degrees on the bottom and 78 degrees on top of the substrate.
Is there something Im missing here?

[M3chan1ca1]

Let me rephrase.

I am able to get 90 in basking and an 80 ambient temperature.
However I keep having to switch heaters and continuously spray to keep humidity up.
Im trying to find a way to keep the heat an humidity constant so I dont have to keep spraying every 10 minutes.

Would an UTH or flexwatt work to heat the surface substrate to an acceptable temprature as well as keeping humidity high enough?
And how would i determine that?

I think the CHE are destroying humidity.

[wax32]

Would an UTH or flexwatt work to heat the surface substrate to an acceptable temprature as well as keeping humidity high enough?
And how would i determine that?

I think the CHE are destroying humidity.

Yes and yes. Get ride of CHE. I'd use less substrate, then put the thermostat probe directly on the UTH or flexwatt. Not inside the tank. Try setting the thermostat for 95 at first (the temp will be a little lower in the tank.)