I’m gonna blow your mind real quick...
So sure, you’re having to set the thermostat to 120 to get a 90° hot spot when the probe is between the UTH and the bottom of the enclosure.
Guess what? When you have the probe inside the enclosure set to 90° can you make a guess as to how hot that heating element is getting? If you guessed 120° you’re correct.
Put the probe outside for belly heat. Period.
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