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

10PCS IR Infrared Slotted Speed Measuring Detection Optocoupler Sensor Module #f

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

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10PCS IR Infrared Slotted Speed Measuring Detection Optocoupler Sensor Module #F