A type of clock works on the principle of ultrasound.

Using the transit time method, ultrasonic flowmeters measure liquid and gaseous mediums. Typical applications include:   Power plants: cooling water and demineralised water, steam, [...]
A revolutionary, precise and ultra reliable ultrasonic bulk water meter with no moving parts. With superior hydraulic and batteries that last more than 15 years, the Octave is today’s best choice [...]

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