Infrared thermometer

How do you keep an eye out for something that isn't visible? An infrared thermometer is commonly used by paranormal investigators to monitor a room's temperature and any unexpected changes in temperature. A single, particularly cold place in a room can be a clue of a spirit that is otherwise undetectable. Just make sure to check for draughty windows or a lack of air flow in a space, since these regular occurrences might give the impression of a sudden flurry of activity!