The Master Calibration Artifact is intended for use by Calibration Professionals with Optical Comparators and other Measuring Systems. As a Reference Standard, all Dimensional and Geometric elements are etched in Chromium right-reading looking through Glass. Overall accuracy: ±0.003mm, Line-to-Line Accuracy: ±0.001mm. Overall dimensions: 5.50”x7.50”x0.25” T. Includes Case.The Master Calibration Artifact provides rapid and accurate analysis of major phenomena, including: Vertical and Horizontal Linear Accuracy Bi-axial Step Gaging Magnification and Multiplier Function Verification Squareness Circular and Angular Calculation and Interpolation Repeatability Each comes with a N.I.S.T. Traceable Certificate of Accuracy. Click here to download drawing