干分表与百分表均为常用指示式量仪，它们的用途相同，但千分表主要用于精密测量。千分表的工作原理是通过齿轮齿条或扛杆齿轮传动将测杆的直线位移转变为指针的角位移。由于千分表结构简单，使用方便，而且测量准确度较高，故使用极为普遍。目前使用较多的千分表是利用扛杆齿 Dry points and dial indicator are commonly used indicator instrument, their use is the same, but the dial indicator is mainly used for precision measurement. The working principle of the dial indicator is that the linear displacement of the measuring rod is converted into the angular displacement of the pointer through the gear rack or carry rod gear transmission. Because dial indicator structure is simple, easy to use, and the measurement accuracy is high, so the use is extremely common. Currently using more dial indicator is the use of lever teeth