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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
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Cross Laser Diode - 5mW 650nm Red : ID 1058 : $8.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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