Sorive Deluxe Head-Worn Glasses Magnifier 10x 15x 20x 25x LED Double Eye Jeweler Watch Repair Magnifying Eyeglasses Loupe Electronic Repair, Jewelry Appraisal, Miniature Engraving SORIVE0020 Mechanical processing, electronic repair, jewelry appraisal, timepieces repair and miniature engraving etc. Included 10x 15x 20x 25x Lens , too high magnification can not to reading books. Left/right double eye patches magnifier with LED, It can't use both of eyes lens (when you working ), because focal distance from lens to product is 0.2-2in (0.5-5cm). 4 different magnifications can be interchanged quickly. If this magnifier is used for long time, you may use two lens barrels alternately to eliminate visual fatigue and improve work efficiency. Bracket and headband is interchangeable to each other. It is advisable to choose lens barrels of appropriate magnification according to the size of the object to be observed. Hands-free eyeglasses legs and elastic headband are interchangeable for more comfortable and tight wearing.