Da7 Optivisor Magnifier with Single Lens 6" Focal Length 2.75x

This optivisor features a dial adjustment headband to fit any head size. Well-made magnifier is lightweight and durable, and easily fits over eyeglasses. The adjustable pivot assembly on visor can be set to desired tension, so it will stay in place when tilted. Working distance is 6". Improves vision and reduces eyestrain. Includes one optical-polished 2.75X glass lens. Made in the U.S.A. *Please note that for best results, choosing the lens with the lowest power necessary is ideal. The greater the magnification, the shorter and smaller your focal length and field of view will be. Choosing a minimal one helps to ensure the most ideal field of view and focal length to complete your jewelry making projects.