long range lazer thermometre pistol

[BENZINAS]

is it possible with a pistol like that to find a sealed cave etrance looking only the temprature numbers , is it possible to take a diferent temprature number when we pinpoint with lazer on the sealead etrance which has empty space behind rocks and when we pinpoint next to the etrance on a simple rock , is it possible with tha same way to find a underground hidden room when we pinpoint to the ground and see if temprature changes ? wait for your opinions !