"Outside calipers" are used for measuring external sizes, and "insidecalipers" 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
Inside diameter micrometer micrometer plug gauge thread gauge digital calipers height gauge and other testing tools.
内径千分尺、千分尺、塞规、螺纹规、数显卡尺、高度尺等检验工具。
3
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.