noun
a device used for measuring the acidity or alkalinity of a substance
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The acidometer is a precise instrument used in chemistry labs to measure the acidity of a solution.
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I used the acidometer in my science experiment to test the pH level of different liquids.
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Hey, can you pass me that acidometer thingy so I can check if this lemonade is too sour?
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Her sharp tongue acted like an acidometer, always ready to measure the acidity of any situation.