Taking Doug's question one step farther, are readings
distorted by moving air or other environmental conditions?
How consistent and reliable is it's operation?

"P. Thompson" wrote:
Get one of those infrared thermometers and point it around the attic if
you can move around reasonably in there. I have an Extech IR201 (one
of the cheaper ones) but any brand will do.

Mine showed that my efforts to close the gaps around my vent stack
penetration were unsuccessful by identifying a warm plume of air coming
out around the insulation.