1.75x Binocular Magnifying Visor, Optivisor lenses work with this model

HVM-3 headband magnifying glass is worn over the head leaving both hands free for working. Headband is fully adjustable to fit any size quickly and easily and is ideal for Watchmakers, jewelers, tool & die makers, engravers, stamp and coin collectors, needlepoint, physicians, dentists, pharmacies and hospitals. Headband is adjustable +/- 60% either way Our 1.75x lens gives you an versatile and comfortable working distance of 14" or 355mm ideal for most applications. Can be worn over glasses.