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

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

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

10PCS Slotted IR Infrared Speed Sensor Module Distance Measurement Optocoupler #

IR Infrared Slotted Optical Speed Measuring Sensor Optocoupler Detect Module *tm