Mag Screen Table Magnifier is a free standing fresnel magnifier with a weighted base, and fully adjustable lens. Stretch arm can be placed in weighted base or clamped to a table to ensure you can position the lens perfectly. Hands free table magnifier. View a large area. The fresnel lens is made from flat acrylic to enable a flat large lightweight lens. Large Lens: 10"x7"x Flat. Adjusts up to 4X power.Use as a base table magnifier or a clip-on table magnifier.Use this table magnifier for reading and inspection and computer screen enlargement.