DM-3.7 Dome Magnifier 3.7" Inch diameter (large size) and 3.5x magnification, the 3.7 inch will magnify wide lines of text and numbers. Dome Magnifiers are one of the easiest magnifiers to use, just place the magnifier on a flat surface for 3.5x magnification ideal for magnifying newspapers, charts, paperwork, books, financial and accounting statements and documents. Simply place the Dome magnifier on the surface and glide across to easily view with 3.5x magnification, the bottom of dome magnifiers is slightly concave to prevent scratching. This Large 3.7" Dome magnifier can magnify a full column of a newspaper. This Large Dome magnifier can easily magnify a full column of a newspaper.