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ERH India (1 Pc) HC-SR04 Ultrasonic Sensor Distance Module for Arduino Uno and All Type of Devlopment Boards and Robots : Amazon.in: Industrial & Scientific
Amazon.com: #10Gtek# HC-SR04 Ultrasonic Module Distance Sensor, for Arduino UNO Mega2560 Nano Robot XBee ZigBee Micro Controller, Pack of 5 : Industrial & Scientific