Users are always trying to make highly clear dot alignment at quite long work distance, it is not easy to reach with a simple blue laser pointer. However, after advanced use of an import 445nm blue laser diode up to 50mW to 100mW, equipping with a glass window and glass coated lens, it is working well with high quality blue laser light emission from beam aperture, and also keeping highly stable dot generation under harsh occasion of moisture or dust as well. This 16mm diameter metal housing tube made blue laser diode module enables the maximum installed distance of 3 meters. Only after its correct use of output power and freely adjusted laser beam focus, not relying on any manual labor force input and prior dot positioning work, this blue laser makes sure of high efficiency, low cost and high brightness dot alignment for both industrial and high tech precise dot measuring work fields effectively.