Ya I would not aim it in the snakes face, but those IR beams come out in cones that can be over 6 inches across depending on how far away u hold the thermometer.
I know the laser is not going to emit much heat, but the laser is not what measures the temperature on the IR thermometers, the laser is for aiming purposes, it measures temp with an invisible beam of Infrared...
And although they wouldnt see the normal light from the infrared heat bulbs i am sure they can "see" the "heat" from them with their heat sensing organs...
I guess what I am trying to say is this:
I know ball pythons can "see" heat with their pits on their lips...
I know IR cameras display heat...
So is the IR light from my thermometer "visible" to my ball pythons?