Hi guys, I was wondering if I should measure the cool side ambient temps or the temperature of the floor on the cool end for my blue tongue skink. I have a thermometer that measures ambient temps at the cool end, and it always reads in the range of 75-79* but my temp gun reads 81-83* as surface of the substrate temp. Is that ok or should the actual surface of the substrate be in the 75-79* range with the ambient temps lower?