Straightedge rule (square rule, slide gauge, inside and outside micrometer, steel tape, feeler, dial gauge, depth microm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。