Patent ID: 7390124

Claim:
A measuring device for measuring the temperature of a measured spot of a measured object without contacting the measured object, said measuring device comprising: a detector; an optical imaging system for projecting electromagnetic radiation from a measured spot of a measured object onto said detector; and a sighting device for marking the position and/or the size of the measured spot on the measured object, said sighting device comprising at least two light sources that each provide a respective sighting ray; wherein the optical imaging system defines a focus point of the measured spot from said detector, the focus point being adjustable with respect to the detector, in a reproducible manner, from a near position to a distant position and from the distant position to the near position; wherein at least one of said respective sighting rays of the sighting device is dedicated to short-range marking and at least one other of said respective sighting rays of the sighting device is dedicated to long-range marking; and wherein said sighting device is equipped to automatically switch between short-range marking and long-range marking upon the focus point being adjusted from the near position to the distant position.