Yes, if that perch is in fact 90F that will be the hotspot. Then the other two will be lesser temps so it can regulate itself properly.
An IR temp gun is still very important. When I got one I can not tell you how wrong some of my temps were. It showed me that many surface temps were way off from where I would have thought them to be. It really showed me that analog thermometers are really not that great for trying to determine a snakes warm zones and even though the digital thermometer with a probe are better they are still no where near as good as a temp gun.








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