HC-SR04 Ultrasonic Sonar Distance Sensor + 2 x 10K resistors Adafruit Industries Go to product viewer dialog for this item.
An immersible plate for large-scale cleaning systems, available from Granbo .
A reliable industrial transducer for precision cleaning available at Asonic .
A complete learning kit for beginners available at RobotShop.com , including an Uno R3 microcontroller and lesson guides.
Submersible 1500W 28KHz SUS304 Industrial Portable Ultrasonic transducer Packs Go to product viewer dialog for this item.