A person, tool, or device used to calibrate or adjust measuring instruments to ensure they read accurately.
From calibrate plus the agent suffix -or (from Latin, meaning 'one who' or 'that which'). This standard English word-building pattern creates nouns for tools and people who perform actions.
A calibrator can be anything from a precision tool costing hundreds of dollars to a person with decades of experience—some calibrators are so specialized they only work with one type of super-sensitive equipment!
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