Why should a micrometer be periodically calibrated?

A micrometer should be periodically calibrated primarily because external factors, such as dropping it, can affect its accuracy. Calibration ensures that the instrument provides precise measurements, which is critical in aviation maintenance where even small inaccuracies can lead to significant problems. Regular calibration accounts for any potential damage or wear that could occur during use, allowing the technician to confirm that the micrometer operates within the specified tolerances required for safe and effective work.

While cleanliness is important for measurement accuracy, ensuring cleanliness does not address the fundamental issue of measurement reliability that can arise from physical impacts or other forms of mechanical strain. Aesthetic quality is not a relevant factor in the operational effectiveness of a micrometer, and weight considerations are not typically a priority for measuring tool performance. Therefore, the calibration process focuses on maintaining measurement integrity rather than these other factors.