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General Features 10x Power 21 mm ( 0.8" ) Diameter LED Illumination Glass Triplet Lens Multi-Coated Uses Three LR927 batteries ( included standard) Dimensions - 2.0" x 1.2" x 0.9" ( 51 mm x 30 mm x 23 mm) Weight - 2.0 oz ( 57g) Details Celestron multipurpose magnifiers can be used for a variety of functions: Hobbyists – coins, stamps, gems, etc Discovery, Education & Adventure – insects, plants, bugs, rocks, etc. Quality Control – inspection of PC boards, materials, etc. Jewelry Inspection – gem quality, engraving, etc. Home Medical - simple inspection of skin, cuts, etc.