Excellent tool for spreadsheets and accounting projects. Not only does the magnification assist you in reading your line items, the magnification also pulls in ambient light to illuminate what you are looking at. 20 x 2.5 cm (8″ x 1″) ruler lens has both inch & metric rules. 2X magnification. Optical quality lens pre-focused where it sits. Collects light to brighten viewing area. Lay directly on top of printed materials for a sharp, distortion-free view. Compact, easy to use for homes, business, library, recreation, craft or travel. Aids those of us with Presbyopia (diminished close vision that eventually effects EVERYONE). Total Length - 25.5 cm (10″), Width - 4.5 cm (2″).