Granite Tri-Square Long Form Calibration Certificate No Material Granite Application Grade Laboratory Color Pink Flatness 0.000025 in per 6 in Grade AA Height - Inch 12 in Height (mm) 300 Included Certification Short Form Certificate of Accuracy with NIST Traceability Length (In.) 9 in Length (mm) 225 Number of Finished Faces 3 Number of Pieces Single Block Parallelism 0.000025 in per 6 in Maximum of 0.00005 in Size (In.) 9 in x 12 in x 3 in Size (mm) 225 mm x 300 mm x 75 mm