JSP SUPER-VISOR with 4 interchangable GLASS lenses

JSP® BINOCULAR MAGNIFIER VISOR INCLUDES 4 OPTICALLY CORRECTED GLASS LENSES 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 #2, #3, #5, #10 diopter lenses.
Aluminum adjustment knobs will not strip. The headband now has a super comfort strip for long time use..