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

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10PCS IR Infrared Slotted Speed Measuring Detection Optocoupler Sensor Module *i

2X(10PCS IR Infrared Sensor Module Slotted Optical Optocoupler Speed8825

10PCS IR Infrared Slotted Speed Measuring Detection Optocoupler Sensor Module *l

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10PCS IR Infrared Sensor Module Slotted Optical Optocoupler Speed Measuring9292