Ultraviolet Infinite Brightness LED Gem Identification Flashlight 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. 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. Adjustable Output with a Twist An innovative rotary switch allows you to easily select from infinite brightness outputs so you always have the right light for any task. The convenient rotary switch is easy to operate, even when wearing gloves. Designed for Professional Use 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! Specifications LED Ultraviolet Maximum Brightness 3000 mW/ 365nm Peak Beam Distance yards Peak Beam Intensity cd IP Rating IPX8 - 2m waterproof and submersible Impact Resistance 1 m Dimensions L-5.31"xW-0.62"xH-0.62" Weight 2.34oz Brightness MODE OUTPUT RUNTIME Turbo 3000mW 4 hr 15 min UV(Ultralow) 5mW 500 hr Compatible Power Sources BATTERY TYPE SIZE NOMINAL VOLTAGE COMPATIBLE 18650 Rechargeable Li-ion battery 18650 3.7V Y (Recommended) Primary Lithium battery CR123 3V Y (Recommended) Rechargeable Li-ion battery RCR123 3.7V Y