Quote Originally Posted by Chuck1289 View Post
Ok well i have a thermometer measuring the temp and should i place the sensor under the substrate or under the whole viv on the top of the UTH.
As long as you have something else measuring the temp, then it doesn't really matter where you place the thermostat probe. I like to place mine under then enclosure, so that it doesn't get messy, but I place my thermometer probe inside the enclosure. Try to get you thermometer to read 92F consistently, and keep turning your thermostat up and down, until you do.

Hope this answers you question.