500mW Green Laser Pointers: 500mW Blue, Red Laser Pen for Sale | Laserpointepro
405nm Blue/Violet Dot Laser Module 500mw Diode Laser DC 12V/ Fan Cooling & TTL 1-20K Hz & Long Time Working: Amazon.com: Industrial & Scientific
Amazon.com: CNC 24V blue laser module for laser engraving and cutting machine 24V with PWM/TTL can cut 3mm balsa wood can engrave stainless steel (33×33×70mm) : Arts, Crafts & Sewing
Amazon.com: 450-500mW Violet Laser Module With Holder For Mini Engraving Machine