When dot measuring work is processing under night version, it just makes an easy job after the adoption of a long wavelength made device of 808nm infrared dot laser diode module. It emits invisible infrared laser beam directly from 808nm infrared laser diode. Only after its professional equipment with night version device, and correct use of an external AD/DC adapter, it makes high efficiency infrared laser light conversion, and highly precise infrared dot alignment under all night version fields effectively.