Why is calibration necessary for a micrometer?
To ensure accurate measurement readings
A micrometer is a precision measuring instrument, and its reading is only trusted if the tool itself is correct.
Over time, wear, dirt, or a knock can shift the zero and make every reading slightly wrong.
Calibration checks the micrometer against a known standard and corrects the zero so its readings match the true size.
Calibration does not change the measuring range, add decimal places, or enlarge the instrument.
Its whole purpose is to keep the measurements accurate and reliable.
Hence, the answer is To ensure accurate measurement readings.
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