The temp probes go underneath the substrate next to the hide on the hot side.....or you can have 2 sets of probes, one by the hot, and one by the cool. However, most of us you an infrared laser thermometer, because they tend to be more accurate.
Pamela and GINGER, my wonderful BP
1 dog, 3 cats, 1 macaw, 1 husband, 1 daughter, and GINGER
Sent from my iPad using Tapatalk