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5PCS IR Infrared Slotted Optical Speed Measuring Sensor Optocoupler Test Module

5-10PCS IR Infrared Slotted Speed Measuring Detection Optocoupler Sensor Module

10PCS IR Infrared Sensor Module Slotted Optical Optocoupler Speed Measuring Sens

IR Infrared Slotted Optical Speed Measuring Sensor Optocoupler Detect Module

5PCS IR Infrared Slotted Optical Speed Measure Sensor Optocoupler Test Module

5x IR Infrared Slotted Optical Speed Measuring Sensor Detection Optocoupler

Infrared Reflective Photoelectr Switch IR Barrier Line Track Sensor Board mo