So I just got my 412L temp gun from RBI delivered today and was wondering where everyone takes their readings from. I have the 30 Quart low profile rack from RBI and im using a Helix thermostat that is set at 93. For substrate im using a few pieces of blank newsprint.

I took the temp in several different spots and wasn't sure which one I should go by. The temp of the actual heat tape was 100. On top of the paper over the heat tape was 86 and when i lifted the paper up the temp for the plastic of the tub was 93. I've been using a digital thermometer for the past year and never knew there was such a difference between below and above the paper.

Any suggestions on which reading I should be using to set my temps would be greatly appreciated.

Thanks,
Terence