Gift Idea 30x 21mm Jewelers Loupe Magnifier Magnifying Glass Lens Chrome plated metal body with glass lens The 30x power loupe has a focal distance of 1/2" (13mm) with 21mm dia lens size Good for identifying small marks on jewelry, watch making industry, specially for inspecting those tiny objects etc. Foldable and tiny, great to have one in your pocket all the time It comes with its own hard plastic felt lined storage case