Laser Thermometers

[clockmanjim]

I've been reading posts that broach the subject of carrying one of these to check wheel bearing & brake temps. Well,I went to the store and picked one up to add to my growing bag of goodies. After I tested it a couple of times, I got to thinking, if I stop at a rest area or when I reach my campground and use this handy gadget to check the temp of my bearings, how do I know if they are hot or normal? I realize that the heat generated will depend on the weight being towed, terrain and distance being towed, but is there any type of chart that tells me what might be normal?
Thanks as always for any input


Jim