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Compared to machining external cylindrical surfaces, hole machining conditions are significantly less favorable, making hole processing more challenging than external cylindrical machining.

With the rapid development of industries such as aerospace, high-end equipment, and electronic devices, precision electromechanical components are evolving toward higher precision, greater complexity, and miniaturization. This trend places increasingly stringent demands on manufacturing processes.

Precision measurement is a cornerstone of modern manufacturing and quality control, and instruments such as vernier calipers and micrometers play a vital role in ensuring dimensional accuracy. This article provides a comprehensive overview of these two commonly used precision measuring tools, explaining their structure, working principles, reading methods, proper usage, and essential precautions.