Description Warranty Information Calibrated Checking Scale with Certificate of Traceability. For use in verifying the reticule measurement scale of most conventional optical Brinell reading microscopes. Features clearly legible marks on a bright white background, placed from 1mm to 0.1mm, increments. Includes a certificate of calibration certification with traceability to the U.S. National Institute for Standards and Technology (NIST). Not for use in calibrating Brinell Optical Scanning Systems. This Product comes with a 1 year Warranty