Why is calibration necessary for a micrometer?
To ensure accurate measurement readings
A micrometer is a precision instrument, and its reading can only be trusted if the instrument itself is known to be correct against a reference.
Over time, wear on the anvil and spindle, dirt, or an accidental knock can shift the zero, so every reading becomes offset by the same error.
Calibration checks the micrometer against a known standard, such as a gauge block or the setting standard, and the zero is corrected so readings match the true dimension.
Calibration does not change the measuring range; the range is fixed by the frame and spindle travel of that particular micrometer.
It does not add decimal places or enlarge the instrument; the least count and size are built into the design, not created by calibrating.
Its sole purpose is to keep the measurements accurate and repeatable.
Hence, the answer is To ensure accurate measurement readings.
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