In process of high precision and high brightness dot projection for both of engineering surveying and layout works, engineers prefer to apply a direct diode emission made Berlinlasers 515nm green laser diode module. After its correct use of output power and properly adjusted green dot diameter, it makes good job for marking specific points and aligning the intersections of axes.
https://www.berlinlasers.com/515nm-green-laser-diode-module