When users are trying to make highly clear and quick response dot alignment, even though it is processing at quite long work distance and high lighting, it is always not a hard job until selecting a quite practically used device, such as a 30mW 532nm green laser diode module. It is emitting the brightest and the most visible green laser light from middle wavelength of 532nm green DPSS laser system. On condition that compact size tube green dot laser gets proper installation and connects with external electric power source, it is able to work with high quality green laser light source emission, and highly clear green reference dot projection for both long time and long distance use. On condition that 30mW 532nm green laser diode module gets the best use of 532nm green DPSS laser tech, after getting quite low laser beam divergence of less than 1mrad, it is always making quite satisfied dot measuring results for both long time and long distance uses. It is emitting the most sensitive and the most easily absorbed green laser light, which is also able to get only 1mm to 2mm dot diameter at 2 meters work distance. Usually within the maximum work distance of 25 meters and other high lighting working occasions, green dot laser is able to make quite satisfied dot measuring result as expected. Any time 30mW 532nm green laser diode module makes good use of qualified glass coated lens, even though it is pointing at quite long work distance and other high lighting working occasions, it is projecting high transmittance green laser light, and highly clear green reference dot without any light decay or blur in continuous use. Every time it is trying to continue for quite long time, this 532nm green dot laser also passes through a series of strict laser beam stability tests. For instance, according to a series of tests, including super rapid electric current adding test, alternative high and low temperature change test and up to 24 hours aging preventing test, it gets excellent laser light cycling use, and highly stable and reliable dot positioning result within maximum work time of 8 to 10 hours. Being made with special design part of APC, ACC driving circuit board, without any affect by increasing temperature of laser tube, 30mW 532nm green laser diode module is always performing with constant output power and electric current supply. It maintains highly stable and clear green dot indication at quite long work distance for a lot of application field. Only after easy screw of adjustable focus optic lens, green alignment laser gets high speed green laser light focusing and the most precise dot alignment in distance.