20X Lighted LED Illuminated Jewelers Jewelry Loupe Magnifying Glass Magnifier Illuminated 20x high powered magnifying glass loupe with 18mm Diameter optical glass lens Teardrop loupe has a crystal clear viewing lens, compact folding capability with screw pin holds 1 Super Bright White LED Bulb. On-Off LED slide light switch, battery compartment lock key, slotted end for key chain or chain attachment. Silver metal construction and case included. Compact size hand held pocket loupe. Requires 3AG7 batteries (included) Great for jeweler's diamond inspection, yard sale or swapmeet buyers, stamp, coin, gems. Also used in science labs for mineral, plant, insect inspection and identification.