A. The best place to take the temperature with Infrared is the middle of the forearm. The Forehead is close to core body temperature but it is useless in North American winter when the guest has to walk a few minutes and forehead skin temperature may drop below 94F. Also scanning Forehead is difficult if an automated IR scanner is used. The Fist is a better alternative to Forehead for automated scanning. But the middle of the arm works better in winter since it is covered from outside cold weather.