Anyone aware of any tests done to ensure best heat probe placement?

I keep seeing posts to place the heat probe for a UTH on a glass tank outside the tank and between the glass and UTH.

This type of placement presents a few issues in my mind.

It's measuring the temp of the UTH, not the glass, and not the internal surface of the tank

The UTH will be hotter than the glass so that's why (I think) the probe is measuring the UTH.

In this scenario, the probe could be taped on the outer side of the UTH if it is in direct contact with it. It is now service accessible for any reason.

Probing the inside surface of the tank over the UTH is most desirable (I think) because this is the temp the BP will see. It is also less likely to be impacted by ambient temp changes and the differences in temperatures the inside glass surface will see because of it - at least in the north east where I'm located. Part of my logic here is that the tank acts as one large heat sink and the temperature swings on the inside can be drastic from what is happening at the UTH

As an example, in my corn snake set up, a UTH directly on the glass resulted in an unregulated temp that fluctuated from 114-134 (no snakes during testing and set up). This was on the inside glass directly over the UTH. I tried several materials and thicknesses to place on the glass over the UTH and found that 1/4" aluminum plate sized 1" larger on all sides resulted in a surface temp that stayed between 81-86 (unregulated)

I have been checking the temp using an industrial surface probe and a temp gun.

My BP set up while in the glass tank will have a thermostat controlled heat pad on the hot side and thermostat controlled CHE offset to the"cold" side. It's permanent home will add a regulated UTH on the cold side.

Is there any reason why the heat probes are not being placed in the glass enclosures?

Thanks in advance for any experience and advice you share


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