So I just got the Zoo Med Hygrotherm setup and running... I'll be getting a Herpstat 4 eventually, but for now I decided to use this. I have my UTH and Repti Fogger hooked up to it. I set the temp to 90, and let it get there. Then checked the glass right over the UTH with the tempgun, and it was only showing 83. After some experimentation, I set it to 100, and the tempgun is showing 92.5 in that spot.

Same deal with humidity... Set it to 55, but while the Hygro Therm was still only reading 45, my digital hygrometer was showing 63. After playing with that, now I have it set to 40, and the hygrometer is showing 55-57.

So who's right? lol