Boston - I got it hooked up to a Rheostat that's actually keeping it dialed at the same temp 24/7 until I get my Herpstat. I check it 5 times a day for the last few months and I just use the temp gun to read the UTH itself. Surface substrate temps and I move enough substrate to get the glass above the UTH. Don't know if that makes sense since you've probably never done it that way but it works. Once in awhile when I have him out I'll throw the probe in just to check accuracy. We're all good here