It is not an easy job to get highly clear dot alignment at long work distance, however, it makes good job with an intense beam emitting tool, such as a 445nm blue laser diode module. It is projecting highly intense and powerful blue laser light directly from a 445nm blue laser diode up to 50mW to 100mW. The advanced use of glass coated lens is cooperating with a glass window, after up to 24 hours aging preventing test and beam stability test, it is working well with high transmittance blue laser light emission and highly clear blue dot alignment in multiple working occasions, including moisture or dust. In occasion that blue laser gets proper installation and adjustment to correct position, not relying on any manual labor force input, this blue dot laser always makes sure of high precision, low price and long lasting dot alignment for all application fields.
https://www.berlinlasers.com/445nm-blue-laser-diode-module