30X magnification with LED and UV light, 22mm lens diameter, 3-piece lens, achromatic optical glass, metal body. Magnifiers designed for hobbyists and professionals. Achromatic lens: Limits the effects of chromatic and spherical aberration and eliminates color fading. Excellent color clarity and transparency. Uses: For jewelers, machinists, stamp and coin collectors, artisans, photographers, hobbyists, watchmakers, and others who need to make microscopic observations of target objects.