Tera 30x21mm Compact Mini Eye Loupe Magnifier with 30x Magnification for Watch Making Jewelry Inspecting Coin Collecting with Tera Dust Cloth Made of optical glass and protected when not in use by the swing-out alloy cover The 30x power loupe with 21mm dia lens size Pocket size(1.3x1.1") , light weight(1.7oz), easy for carrying Comes with its own hard plastic felt lined storage case Suitable for Watch making, jewelry, coin, stamp, antique inspecting , etc.