"Outsidecalipers" 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.