"Ultrasonic devices" refers to tools or equipment that use sound waves at a very high frequency that humans cannot hear. These devices are often used for various purposes such as cleaning, measuring distances, or medical imaging. Full definition
Consider, for example, that some dog trainers use ultrasonic devices in the form of dog whistles to communicate with their four - legged partners. (cuteness.com)
The KPest Ultrasonic Pest Repeller package comes with six plug - in ultrasonic devices about the size of your average night light. (geekwrapped.com)
Tuesday evening, Southwest Airlines announced that its entire fleet of more than 700 CFM56 - powered 737s will be inspected for cracks using ultrasonic devices within the next 30 days. (businessinsider.com)