I was looking into buying the PE-2 temp gun from pro exotics. I allready own the PE-1. When I was reading the information on this gun, I found out that the gun can sense infrared light. What is infrared light in terms of reptiles? Whats the point of detecting it? Can too much effect the reptiles? I know what it is in terms of earth science, but I would rather have an explanation of it dealing with reptiles.

Thank you for all of your help!

-Paul