B&Y Double Deck Glass Lenses Portable 15X Magnifying Carry in pocket or purse Perfect low vision reading aide for books, menus, magazines, etc. | Great versatile magnifier for inspection, crafts, hobby and tasks Precision Machining and Anodizing for Maximum Strength and Wear Resistance, Completely Sealed and Nitrogen Filled for Fog/Weather Proof The clear shell casing that comes already is shockproof and waterproof Windage/Elevation Adjustability for Optimum View Centering. Refer user manual for list of compatible manuals