After doing some tank research, I made some changes to my setup. I used to have the digital thermometer wire just running along the top of the substrate with the probe running under and into the warm hide. With that setup the temps were reading 90-94.

I made the change of running the wire under the substrate (taped down with black electrical tape) running over to the warm hide and buried under the substrate all the way to the warm hide.

I have a UTH under the warm hide. my problem is not the temps on the thermometer read about 98-105. I have the UTH on a rheostat, and these are the results i get on the lowest setting.

I just ordered a Herpstat ND. Im wondering should i place the probe for the herpstat under or ontop of the substrate? Will there be that much of a difference in temp?

Also, could the temp difference be due to the entire wire and probe being heated by the UTH, or due to a cheap thermometer?

Nothing else in my setup has changed, so Im pretty sure the temps are the same. Yes i could invest in a temp gun, but im a little tight on funds and the herpstat seemed like a more sensible purchase.

Sorry for the rant, thanks!