In any type of high precision dot measurement at various work distances, including those of high lighting occasion, it is operating easy and quick with a high brightness Berlinlasers 532nm green laser diode module. It is projecting the most visible green laser light from 532nm green DPSS laser within 5mW to 100mW. 
Being made with 5V, 9V 1000mA DC power supply, within freely installed distance of 3 meters, this green laser diode module enables easy installation, and constant green laser beam and green dot emission from laser beam aperture. It assures long lasting green laser dot emission within 8 to 10 hours. Any time it gets correct output power and freely adjusted dot diameter, without the use of sunlight, this green dot laser assures no mistake and no barrier dot alignment for drilling system, laser marking machine, laser engraving machine, lab experiment and scientific experiment etc.
https://www.berlinlasers.com/532nm-green-laser-diode-module