The MM-22, MagniMark™ is a Fresnel thin 3x Power Page Magnifiers with 6-Inch Ruler that is great for reading small print anywhere. Its flat design allows it to fit into any book, making it the perfect multipurpose bookmark. It also acts as a 6 inch ruler, with its easy to read markings on the side. The bookmark is a great item for a teacher, avid reader, or anyone who has to read small print.