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A02YYUW Waterproof Ultrasonic Sensor STINGER Get professional-quality prints at aDescription: Ultrasonic distance sensor A02YYUW 3 450cm waterproof DFRobot SEN0311. Ultrasonic distance sensor measuring the distance by measuring the time between sending and receiving a pulse. The A02YYUW is an easy to use, high quality distance sensor that features a much smaller dead zone, a wider measuring angle and resistance to water and dust, compared to other similar sensors. It allows to measure distances from 3 cm to 450 cm. It communicates