sonic depth finder
noun
: an instrument for determining the depth of a body of water or of an object below the surface by measuring the interval of time between the emission of a sound signal and the return of its echo from the bottom or the object
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“Sonic depth finder.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sonic%20depth%20finder. Accessed 23 Nov. 2024.
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