An instrument that measures the acidity or citric acid content of fruit juices or other liquids.
From Latin 'citrus' (citron tree) plus Greek 'metron' (measure), combining the citrus fruit with the concept of measurement—created during the scientific revolution when precision instruments for food analysis became important.
Before modern chemistry labs, farmers and juice producers used citrometers to guarantee quality—it's one of those specific tool names that shows how seriously people took fruit science!
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