What is the best solution to make highly clear dot alignment at long work distance? It is not easy to reach with simple laser pointer or other manual dot projecting tool, it would be much better solution to make good use of a 50mW 650nm red laser diode module. It applies import 650nm red laser diode, owing to its mature laser diode tech and long developing history, after special use of cooling system, this red dot laser achieves superior nice thermal emitting, highly stable dot projection and low production cost. This red laser diode module employs qualified glass coated lens. It is performing better than plastic coated lens, getting no decay light in constant use. It keeps work with high transmittance red laser beam emission and highly clear red dot projection in distance. This compact size red dot laser enables easy installation and adjustment of laser beam focus and dot projecting direction, thus achieving no mistake and no barrier dot alignment effectively. Technical data: Item: Berlinlasers 50mW 650nm red laser diode module Laser class: IIIb Optic lens: glass coated lens Adjustable focus: yes Power source: 9V 1000mA DC power supply Applications: drilling system, military targeting, laser marking and laser engraving machine etc http://www.berlinlasers.com/650nm-red-laser-diode-module