The micrometer, which is also called a clock gauge, is a measuring instrument which is more precise than a common ruler. 分厘卡又叫千分表,是一种远比尺子精度高的长度度量工具。
The errors of the stand-off measurement and measurement errors made by pitch diameter gauge and ovality gauge are analyzed and compared. 分析比较了紧密距测量以及中径和椭圆度量规测量的误差。