样板直尺是一种测量尺寸不大于500mm的表面直线度偏差和平面度偏差的最普通的量具。目前生产文献[1]规定的0、1和2级样板直尺。根据文献[2]各级直尺都要用检验对板以“光隙法”或用一种装置进行检验。“光隙法”不可能测量出直线度偏差值的大小,而仅能用眼睛按量块组成的标准光隙估读。对于较好的 Sample ruler is a measure of the size of not more than 500mm surface straightness deviation and flatness deviation of the most common measuring tools. The current production of literature [1] 0,1 and 2 model ruler. According to the literature [2] at all levels of ruler should be used to test the board to “gap method ” or a device for testing. “Gap method ” It is impossible to measure the deviation of the degree of linearity, but only with the eyes of the standard optical gap composed of the amount of reading. For better