方形角尺Granitesquaresrulers规格Type(mm)相邻两测量面垂直度Squarenessbetweenadjacentmeasuringsurfaces测量面直线度Straightnessofmeasuringsurface相对测量面平行度Parallelismbotweenopplsitemeasuringsurface精密等级Precisiongrade( m)OO级O级OO级O级OO级O级160*160240.81.724200*200240.91.824250*2502.24.5122.24.5300*3002.65.21.12.32.65.5用于垂直、平等度检测，并可作为900绝对测量基准。Oninspectionlfverticalityandparallelismaswellasabsolure90 measuring.