Fathometer is used to measure

Which sensor or detector is used to measure the distance or depth of the ocean, and how does it work? - Quora

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A hydrometer is used to measure of liquids.

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Fathometer is used to measure?

Fathometer

What is the function of a fathometer? - Quora

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Wholesale Fathometer And Modern Kitchen Cooktops

History: Historical Documents: Radio Talk on Echo Sounding: NOAA Office of Ocean Exploration and Research