An instrument used to measure the concentration or strength of an acid in a solution.
From Latin 'acidus' (acid) combined with Greek 'metron' (measure). Developed in the 18th-19th centuries as chemists needed precise ways to measure acidity.
Before digital pH meters, chemists and brewers used acidimeters to measure acid strength—the word itself is a beautiful example of how 'metron' (measure) appears in hundreds of scientific instruments.
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