1.表圈转动圈为金属外圈 Adjustable steel dial ring. 2.量杆上部为随动于量杆的防尘帽 Anti-dirty screw rises while lifting measuring spindle. 3.带公差指示器 With adjustable tolerance markers. 4.带表圈紧固装置 With dial locking screw. 5.窄刻度读数 Narrow graduation.
