Do you guys measure Hot side temp on the glass or in the substrate or above the substrate.

Apparently Mmephis knocked my temp probe from the glass to just barely in the substrate. So my awesome consistent 90-92 all day temps on the hotside was false. I just had him out and was cleaning his water dish, when I decided to straighten the wires out. I reset the probe on the glass and reburied it, then noticed the temp climbed to 95, so I unplugged my UTH, and the temp continued to 108.1 before it started cooling off.

So again probe on the glass, or above the substrate for the 90ish degree for hot side and 80ish degree for the cold side???

Guess I will be running to the store in the morning for a thermo or rheostat.