[PORTABLE DESIGN] It is very convenient to carry and you can use it anywhere. It requires 3 LR1130 batteries. [ MEASURING INSTRUMENT]For Jewelry Authentication. Good for Gems, Jewelry, Rocks, Stamps, Coins, Watches, Hobbies, Antiques, Models, Photos Industry, House living, and . Jeweler's loop makes it possible to distinguish and see objects clearly. [2 LENS MAGNIFIERS]Primary lens: 30x22mm, Supplementary lens: 60x12mm. The light switches sides for whichever lens you want to use. The lens should be really close to the object to see the details clearly. If the lens is far away from the object being viewed, it be blurred or an inverted image. [BRIGHT LED AND UV LIGHT]You can see objects clearly in dark or insufficient light conditions with this dual LED light source. [SIMPLE & PRACTICAL DESIGN]Neat and beautiful, which can be put into the wallet, shirt, and pants pocket, flip-open pocket magnifier with a built-in folding case that can protect the lens from dust and damage.