Thanks for the explanation but I think you missed my point. I was referring to where to properly take ambient temp measurements. If your thermometer probe isn't at snake height than you aren't measuring the temp of the air the snake is actually breathing. Most snakes, especially in a rack, remain on the floor of the tub, and breathe the air half an inch off the ground for the majority of their life. Taking air temps from a thermometer dangling above the snakes head gives you little information.

Also, as someone who has worked with many a vet, most will admit they know less about the advanced husbandry of reptiles than the average snake owner.