This listing is for one extra large Dome Magnifier by  Electro-Optix we have been in the optical business over 50 yrs, this is a  3.75 " inch Dome magnifier DM-3.75V model, and its large size will easily magnify Ideal for low vision aid for macular degeneration and reading small print,  stamp inspection, coins, maps  and reading of documents. Made with 100%  solid optical grade acrylic. 

Dome Magnifiers are Dome shaped Vision Aids that are ideal for reading newspapers, maps, contracts,charts, blueprints, architecture plans, negatives, documents, menus, bills, and other reading material! Excellent vision tool for macular degeneration.