The Sight-Booster Head Magnifier Kit is a well made unit and will provide years of use. Three lens plates are included with this head magnifier for a wide range of magnification. No tools are necessary to change the visor magnifier lens plates. A soft pliable  Velcro adjustment provides a perfect fit. The visor magnifier flips up when not needed and can be worn with eyeglasses. All lens visor magnifier plates are hard coated. The magnifying visor is Made in U.S.A.-Hands free head magnifier. 
PRECISION OPTICS-NO EYESTRAIN.
LP-3  1.75X @ 14 INCHES

LP-5  2.25X @ 10 INCHES

LP-7  2.75X @   8 INCHES