When dot measuring work is processing continuously or quite long work distance, it should be quite advanced solution to make use of Berlinlasers 50mW blue laser diode module. It is only projecting moderate brightness blue laser light from 445nm blue laser diode. However, this direct diode emission blue dot laser just gets increasing stability blue dot projection. Only if it gets enough space leaving for metal heat sink cooling system inside durable aircraft used aluminum alloy housing tube, it achieves increasing stability blue dot projection in continuous use. This 50mW blue laser diode module enables easy use in any work field. It selects DC input power supply, which is able to work with continuous blue dot projection and clear dot instruction within the maximum work distance of 25 meters. Usually users can make easy screw of adjustable focus optics, after immediate blue laser light focusing, this blue dot laser makes the most precise dot projection in distance. When blue laser gets proper installation and adjustment to correct position, it makes high precision dot alignment in distance effectively. Technical data: Item: Berlinlasers 50mW blue laser diode module Laser class: IIIb Optic lens: glass coated lens Adjustable focus: yes Power source: 9V 1000mA DC input power supply Applications: laser marking, laser engraving, industrial laser dot alignment etc http://www.berlinlasers.com/445nm-blue-laser-diode-module