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An optical supervisor II Endless applications: Jewelers, watchmakers, engravers, dental, medical technicians, electronic precision assembly and repairs, hobbyists-stamp, coins needlepoint, fly-tying and countless other uses. Unique features: 4 separate lenses combine all focal combinations. 1.2x focal length: 20 inches (4.8cm) 1.8x focal length: 14 inches (3.5cm) 2.5x focal length: 8 inches (2.0cm) 3.5x focal lengh: 4 inches (1.0cm) Lenses can be combined to make up to 24 different strengths up to 7x. Pinpoint light swivels to direct light on the magnified area, comfortable headband and easily adjustable and lightweight and pressure free.