Quote Originally Posted by bigrich0086
i have the uth only on half way and its reading 83 if i turn it all the way up itll ready almsot 98 at the surface fo the mat but 89 top of substrate. and im useing a wooded bottom viv with glass sides. so the uth is inside the tank under a inch of substrate.the heat lamp cost way too much to run raise electric bill 20$ this month.
Someone correct me if I'm wrong but... Take the temp at the surface and reduce the thickness of substrate?

What's your cold side reading?