Patent ID: 8042996

Claim:
A device for use with a first target having a first temperature and a second target having a second temperature, said device comprising: a body having a portion, said body being operable to move from between a first position such that said portion is directed toward the first target to a second position such that said portion is directed toward the second target; a light emitter disposed at said body, said light emitter being operable to emit a first light having a first color and to emit a second light having a second color; an radiation detector operable to detect first heat discerning radiation based on the first temperature from the first target when said body is disposed at the first position, to generate a first detected signal corresponding to the detected first heat discerning radiation, to detect second heat discerning radiation based on the second temperature from the second target when said body is disposed at the second position and to generate a second detected signal corresponding to the detected second heat discerning radiation; a temperature difference threshold selector operable to establish an absolute value of a temperature difference threshold from a range of absolute value temperature differences and to generate a temperature difference threshold signal based on the established absolute value of the temperature difference threshold; and a controller operable to determine a temperature difference based on the first detected signal and the second detected signal, to determine whether the absolute value of the temperature difference is within the established absolute value of the temperature difference threshold, to generate a first indication signal when the absolute value of the temperature difference is within the established absolute value of the temperature difference threshold and to generate a second indication signal when the absolute value of the temperature difference is not within the established absolute value of the temperature difference threshold, wherein said light emitter is operable to emit, based on the first indication signal, the first light at the second target, and wherein said light emitter is operable to emit, based the second indication signal, the second light at the second target.