Learn how to create a replacement glass chart for a Lufkin Ultrascope 1200A / MicroVu 400 optical comparator in this detailed 34-minute tutorial. Follow along as the process unfolds, from designing artwork in Fusion 360 to using LightBurn software and an xTool D1 laser to burn the design onto glass with CerMark. Discover the steps involved in preparing the artwork, setting up the laser file, applying CerMark spray, executing the laser burn, cleaning the glass, and frosting for a professional finish. Gain insights into refurbishing and upgrading optical comparators while exploring practical applications of laser engraving technology. Perfect for hobbyists, makers, and those interested in precision measurement tools or laser engraving techniques.