Horrizontal and Vertical Lens Adjustment. The Clarity full page magnifier with base is a first quality fresnel lens magnifier, that has crystal clear optics. Lens Size: 8.5"x10.5"---Lens Power: 2X plus Increase lens power by moving the lens further from the object being viewed.This large lens full page magnifier hands free, was originally used in electronic factories for assembly and inspection, and we have converted this product for general use. This is a very sturdy magnifying product, as most parts are made of metal. For Best Results Use With Adequate Lighting