DM-4.5 Huge 4.5" Inch Diameter Dome Magnifier, Solid Optical Grade Acrylic with powerful 3.5x magnification, this is without a doubt the finest Dome Magnifier available and as one reviewer described it, it is the Cadillac of Magnifiers,, this Dome Magnifier has the widest field of view, highest optical clarity and hand finished polish. A Dome Magnifier is extra large one of the easiest magnifiers to use. A 4.5" Dome is the largest size Dome Magnifier made, and is ideal for maps, marine charts, geological charts, maps, architectural drawings. This model is used by the US Navy and other Naval companies for reading navigational charts. Comes with protective storage pouch.