As for the temp gun, getting a read of 93 on your tongue hanging out of your mouth might not be so inaccurate. Your core body temperature may be 98.6, but evaporative cooling could explain a few degrees difference, for the same reason sweating cools you down. The best thing to do would be to test the gun against the reading from something you know to be accurate. Or, failing that, several things you suspect are accurate. Do you have a thermometer in your fridge? Test it against that, and the probe in your snake cages, et cetera.