Amazon.com: HiLetgo 10pcs 5V 650nm 5mW Red Dot Laser Head Red Laser Diode Laser Tube with Leads Head Outer Diameter 6mm : Industrial & Scientific
650nm 660nm Adjusted Red Laser Line Dot Cross Laser Diode Module 3V-5.5V 100mW Laser Dot/Line/Cross Module Focusable 13mmx42mm with US Power Adapter and Heatsink: Amazon.com: Industrial & Scientific