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1·Outside calipers are used for measuring external sizes, and inside calipers for measuring internal sizes.

“外测径器”用来量度外边的尺寸；“内测径器”则量度内部的尺寸。

2·The vernier calipers are measuring tools for the machine shop and inspection department. They are used to measure outside, inside dimensions. Type I calipers are used to measure depth and step.

游标卡尺用于一般机械加工中的测量，可测量内、外尺寸、深度及台阶等。