Laser Transmitter Module KY-008 for Arduino AVR PIC pack of 10: Amazon.com: Industrial & Scientific
4W Industry Laser 445nm/447nm/450nm 4000mW Blue Laser Dot Module Diode NDB7A75 w/ TTL0-20kHz & Fan Cooling & Long Time Working: Amazon.com: Industrial & Scientific
Amazon.com: Laser Sensor Detector Module Receiver Transmitter for Arduino AVR PIC Application for Obstacle detection Pipeline Counter Smart Robot Obstacle-avoiding Car @XYGStudy : Electronics
Amazon.com: 8PCS 3 Pin 650nm 5V Laser Transmitter Sensor Module Board KY-008 Dot Diode Copper Head Sensor Module Diode Laser Mini laser head for Arduino Raspberry Pi Laser : Industrial & Scientific
Amazon.com: HiLetgo 10pcs 5V 650nm 5mW Red Dot Laser Head Red Laser Diode Laser Tube with Leads Head Outer Diameter 6mm : Industrial & Scientific