This 532nm green laser module applies a qualified glass coated lens and glass window inside different dimension metal housing tube. It is generating high transmittance green laser light, and highly clear green dot projection. It is applying for multiple occasions, and no effect by moisture or dust as well. Within long extending distance of 25 meters, a correct output power laser device always makes no mistake use for drilling system, laser marking, laser engraving, military targeting and science fields etc.
https://www.berlinlasers.com/5....32nm-green-dot-proje