In process of highly clear and accurate dot alignment at long work distance, it is far more enough to rely on manual dot projecting tool, but substituting by a 20mW 635nm red laser diode module. It is projecting high brightness and high purity red laser light directly from a 635nm red laser diode. Together with qualified glass coated lens and import laser diode inside 16mm diameter metal housing tube, together with extending electric wires, this red dot laser always enables convenient installation, easy reaching, low production cost dot alignment for laser marking machine, laser engraving machine, drilling system, red laser sight, laser medical therapy and high tech etc.https://www.berlinlasers.com/635nm-red-laser-diode-module