Amazon.com: #10Gtek# HC-SR04 Ultrasonic Module Distance Sensor, for Arduino UNO Mega2560 Nano Robot XBee ZigBee Micro Controller, Pack of 5 : Industrial & Scientific
Amazon.com: OSEPP | Ultrasonic Sensor Module | Ages 5+ | Works with Arduino : Industrial & Scientific
5Pcs Ultrasonic Module HC-SR04 HC SR04 HCSR04 Distance Measuring Transducer IO Trigger Sensor for Arduino 5V DC : Industrial & Scientific - Amazon.com
Amazon.com: Ardest Measuring Module Ranging Ultrasonic Distance Sensor for Obstacle Avoidance in Arduino Projects Pack of 2 by Ardest : Industrial & Scientific
Amazon.com: WYPH Ultrasonic Module HC-SR04 Distance Measuring Ranging Sensor for Arduino UNO for Mega R3 Duemilanove Nano Robot Pack of 10pcs : Industrial & Scientific
Amazon.com: WWZMDiB HC-SR04 Ultrasonic Sensor Module for Arduino R3 MEGA Mega2560 Duemilanove Nano Robot XBee ZigBee (10Pcs HC-SR04 with housing) : Industrial & Scientific
Amazon.com: ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor Compatible with Arduino UNO MEGA Nano Robot XBee ZigBee : Industrial & Scientific
HC-SR04 Ranging Detector Ultrasonic Distance Sensor with Cable by Corpco: Amazon.com: Industrial & Scientific