Infrared thermometers, sometimes called laser thermometers or temperature guns, measure thermal radiation of surfaces or objects from a distance. They have laser sighting elements for taking no-contact measurements and a digital display that shows the temperature reading. They are a good choice when working on hard-to-reach or dangerous electrical systems or mechanical equipment such as power lines or motors. Infrared thermometers help prevent cross-contamination of food during preparation in restaurants or commercial food service. They help firefighters find hot spots in burning buildings, vehicles, or forests. These thermometers should not be used in clinical or medical settings to measure body temperature.