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JAMECO VALUEPRO 139492 40TR12B-R Ultrasonic Sensor Set 40 kHz Transmitter and Receiver: Electronic Component Sensors: Amazon.com: Industrial & Scientific
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IIVVERR Pair Aluminum Housing 40KHz Ultrasonic Transducer Transmitter Receiver (Par de aluminio con receptor de transmisor de transductor ultrasónico de 40KHz - - Amazon.com