An instrument used to measure the amount of acetic acid in vinegar or other solutions.
From aceto- (acetic acid) + -meter (Greek 'metron' meaning measure). It follows the pattern of scientific instruments like thermometer or barometer created in the 18th-19th centuries.
An acetometer works by measuring the specific gravity of vinegar—denser solutions contain more acetic acid—making it a clever gadget that lets you know exactly how strong your homemade vinegar is without any complex chemistry.
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