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Hydrometer

//haɪˈdɹɑːmɪtɚ// noun

Noun

1
An instrument that floats in a liquid and measures its specific gravity on a scale.
"[E]ach degree of the hydrometer, when at or near proof, is about a quart in a hundred gallons stronger or weaker, as the hydrometer vibrates under or over the silver speck or sight on the index or upper stem; at the intermediate or strong overproofs, is about a pint in ditto; and at the low underproofs is about three pints in ditto."
2
a measuring instrument for determining the specific gravity of a liquid or solid wordnet

From hydro- + -meter.

Unscramble this word: hydrometer