341 Straightedge rule (square rule slide gauge inside and outside micrometer steel tape feeler dial gauge depth micrometer wire gage radius gage thread pitch gage) is a kind of common measuring tool.

• 直尺（角尺游标卡尺内径和外径千分尺钢卷尺塞尺千分表深度千分尺线规半径规螺距规）是一种常用量具。