EL9990 = Binocular Magnifier Visor Includes 4 Glass Lenses

Binocular headband magnifier provides hands-free magnification and viewing for a variety of applications such as jewelry-making, watch-making, needlework, artwork, electronic inspection, book-reading, print inspection, and stamp-collecting. Includes 4 lenses in multiple dioptric strengths that provide a specific magnification power (X), depending on the distance from the object Optical glass lenses are ground and polished into prismatic lenses for quality and clarity; easier to clean than acrylic lenses. A dioptric number and a magnification number are not the same thing. Diopter strength represents a specific magnification power (X). For example, a 5-diopter provides 2.5X magnification (at a distance of 8"). Can be worn over prescription or safety eyeglasses. Includes 4 lenses: a 1.5X lens that will focus clearly at 20" away from your eyes. a 2X lens that will focus clearly at 10" away from your eyes. a 2.5X lens that will focus clearly at 8" away from your eyes. a 3.5X lens that will focus clearly at 4" away from your eyes.