方尺用于垂直度、平行度检查，并可为90 绝对测量基准。 花岗石方尺精度等级Graitesquarerulers：编号No规格Dimensionmm相邻两侧面的垂直度Flatnessandbeelineofthemeasuringsurface( m)测量面的平面度和直线度Parallelismofthetwomeasuringsurface( m)相对测量面的平行度Perpendicularitybetweenmeasuringsurfacesandsidesurface( m)两侧面对测量面的垂直度heightdifferenceoftheparalellswithinamatchedpair( m)精度00Grade00精度0Grade0精度00Grade00精度0Grade0精度00Grade00精度0Grade0精度00Grade00精度0Grade0108-2101108-2102108-2103108-2104108-2105108-2106108-2107108-2108100 100 20160 160 25200 200 25250 250 30300 300 30400 400 40500 500 50630 630 601.51.82.02.22.63.03.54.23.03.54.04.55.26.07.08.30.70.80.91.01.11.31.51.81.41.61.82.02.32.63.03.51.51.52.02.22.63.03.54.23.03.54.04.55.56.07.08.315182022263035423035404552607083