Jewelers, appraisers, and gemologists alike will find the GEM10UV an ideal tool for identifying and inspecting gemstones. A powerful ultraviolet LED makes the GEM10UV an ideal tool for amber and diamond identification. An innovative rotary switch allows you to easily select from infinite brightness outputs so you always have the right light for any gemstone. With its compact design, the GEM10UV is a perfect EDC light for law enforcement and security professionals regularly engaged in currency identification or forensic analysis. Weighing less than 3 ounces and marked with a measurement scale for quick size calculation, the GEM10UV will quickly become a valuable addition to any toolkit. Designed for professional use, the GEM10UV is powered by a single 18650 or two CR123A batteries and has a maximum runtime of 500 hours, ensuring your light will work as hard as you do .