When dot measuring work is processing at quite long work distance, not easy to reach with manual dot aligning tool, it is much easy and convenient job to use 515nm 50mW green dot laser module. It projects intense and qualified forest green laser source directly from 515nm green laser diode. After special use of inner cooling system inside durable metal housing tube, it is achieving superior nice thermal emitting and highly stable forest green dot alignment continuously. This 515nm 50mW green dot laser module is pointing onto various working surfaces. The inner glass coated lens ensures high transmittance forest green laser light and small size green dot in distance. In addition, within freely installed distance of 3 meters, it makes easy and quick response forest green dot indication. Only if it gets proper installation and adjustment of laser beam focus, green laser alignment assures no mistake and no barrier dot alignment in all occasions. Technical data: Item: Berlinlasers 515nm 50mW green dot laser module Laser class: IIIb Optic lens: glass coated lens Adjustable focus: yes Power source: 9V 1000mA AC/DC adapter Applications: military dot positioning, laser medical therapy device, laser marking and laser engraving etc http://www.berlinlasers.com/515nm-green-dot-laser-module