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hydrometer
A hyrometer is an instrument used to measure the specific gravity (or relative density) of liquids; that is, the ratio of the density of the liquid to the density of water.
Trivia about hydrometer
(Cheryl of the Clue Crew demonstrates a scientific instrument.) This device for measuring the density of liquids takes its name from the Greek for "water measure"
This instrument is used to check the density of liquids, such as the acid in a storage battery
Since the 18th C., brewers have used this device to measure the alcoholic, not water, content of their booze