Sold as 1 Each. Simplify reading across computer sheets with the tinted guide. Clear plastic ruler features a see-through yellow center panel to highlight one line at a time. Two beveled edges ruled with standard scale on one side, metric on the other. Simplify reading across computer sheets with the tinted guide. Clear plastic ruler features a see-through yellow center panel to highlight one line at a time. Two beveled edges ruled with standard scale on one side, metric on the other.