Vision USA’s Task-Vision Clamp On Flex Arm Magnifier with High Power Insert is made of ophthalmic acrylic, allowing for excellent optics. The lens measures 5” across, and offers a power of 2X, plus a 4X insert for extra close inspection. The lens can be turned vertically, horizontally, swivels 180 degrees, and holds firmly with a coated clip that will attach to any desk or bench.