HC SR04 Ultrasonic Module Ultrasonic Sensor HCSR04 Distance Measuring Module for PICAXE Microcontroller Arduino UNO HC SR04|module usb|module displaymodule communication - AliExpress
Connect a Raspberry Pi Zero with a USB Ultrasonic Sensor | MaxBotix Inc.
ToughSonic 3 Ultrasonic Sensor | Short Distance Ranging Sensor
Model ULSL | Ultrasonic Level Sensor provides non-contact, ultrasonic level measurement of fluids for tall range applications. Applications are pulp & paper processing, sump & process tanks, and chemical processing. | Dwyer