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T-Slot Photo Interrupter with 1 Meter Cable : ID 3985 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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10Pcs 5/32"Slot PCB Photo Interrupter Slotted Optical Sensor Switch HY301-19 - Black - 0.9" x 0.5" x 0.2"(L*W*H) - Overstock - 25414779
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uxcell 10 Pcs 5/16" Slot PCB Photo Interrupter Slotted Optical Sensor Switch HY860H-A - - Amazon.com
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uxcell 10 Pcs 5/16" Slot PCB Photo Interrupter Slotted Optical Sensor Switch HY860H-A - - Amazon.com
![Teyleten Robot IR Infrared Slotted Optical Optocoupler Module Speed Measuring Sensor 3.3V to 5V Photo Interrupter Sensor for Arduino 10pcs: Amazon.com: Industrial & Scientific Teyleten Robot IR Infrared Slotted Optical Optocoupler Module Speed Measuring Sensor 3.3V to 5V Photo Interrupter Sensor for Arduino 10pcs: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/71NfyFjg+xL.jpg)
Teyleten Robot IR Infrared Slotted Optical Optocoupler Module Speed Measuring Sensor 3.3V to 5V Photo Interrupter Sensor for Arduino 10pcs: Amazon.com: Industrial & Scientific
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