You've seen a jeweler's eye loupe used in jewelry-heist movies--the bad guy always seems to have one handy for examining the diamonds. In real life, they're an amazingly useful tool; sort of like a microscope you hold up to your eye to bring the smallest detail into view. This version has been improved with a super-bright LED light because proper illumination is as important as magnification for seeing close-in detail. Slide loupe open and LED comes on automatically - slide closed and lens is protected - perfect for pocket, purse or desk drawer storage. Rugged ABS self-storing case with optical-quality glass lens. LED lights for hours on 3 button-cell batteries (included); easy to replace. Great for watchmakers, mechanics, machinists, stamp and coin collectors, arts and crafts, photographers. One-year warranty and Jack's Tool Shed worry-free Satisfaction Guarantee.