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HC-SR04 Ultrasonic Sonar Distance Sensor + 2 x 10K resistors Adafruit Industries Go to product viewer dialog for this item.

For outdoor or wet environments, this IP67-rated sensor available at DFRobot offers stable performance with a UART interface. Adeept Ultrasonic Distance Sensor Starter Kit with Uno R3 RobotShop.com& more Go to product viewer dialog for this item.

Ultrasonic Welders Converter Transducer 2000w 20khz For Plastic Welder $427.49$450 eBay - dyjt003 Go to product viewer dialog for this item.