In order to get clear and quick dot alignment at close distance, it would be quite efficient solution to make advanced use of Berlin lasers 5mW 532nm green dot laser module. It projects easily absorbing and highly sensitive green laser light from middle wavelength of 532nm green DPSS laser, owing its low laser beam divergence of less than 1mard and quite special laser beam mode of TEM00, this green laser alignment makes sure of highly precise and accurate dot projection in close distance. This 5mW green dot laser module enables easy use after connect with a DC input power supply. It is different from a simple green laser pointer. It gets special use of inner metal heat sink cooling system inside durable metal housing tube, which achieves increasing stability green dot projection. Every time green laser gets proper installation and adjustment of both laser beam focus and dot targeting direction, it makes high precision dot measurement in all occasions. Technical data: Item: Berlinlasers 5mW 532nm green dot laser module Laser class: IIIa Optic lens: glass coated lens Adjustable focus: yes Applications: laser marking, laser engraving, drilling system and red laser sight etc http://www.berlinlasers.com/532nm-green-dot-laser-module