Infrared Thermal Scanner
From Super-wiki
Infrared Thermal Scanner
Tool used by ghost researchers to detect and verify cold spots and monitor fluctuations in temperature within rooms. The ITS is a non-contact thermometer that sends out an infrared beam that hits a surface and bounces back giving the temperature of the object it hits.
1.14 Nightmare
Dean enters the hallway. Checking the coast is clear, he pulls an infer-red thermal scanner from his pocket and turns it on, shining it into rooms as he passes. As he reaches the end of the hall he hears footsteps coming up the stairs and hastily hides the scanner. Sam appears.
And
Dean: Well, if there was a demon or poltergeist in there you think somebody would have noticed something? I used the infer-red thermal scanner man, and there was nothing.
