[Simple and fast] Our diamond tester pen is designed for fast, accurate, and safe diamond testing. In just a few seconds, even a novice can immediately distinguish real diamonds from other simulated gems. [Easy to use] The diamond tester is easy to use, with LED lights and audio alerts. Just place the tip of the diamond tester gently on the gemstone. If the gemstone tested is a diamond, the pen will beep and display a row of fully lit LED lights. If the gem is crystal or zirconia, the tester will not beep. [Easy to carry] The diamond detector and 60X LED lighted loupe are both lightweight and compact, and each comes with a carrying bag. They can be easily stored in your wallet or backpack without taking up much space. This set is a must-have when visiting garage sales, markets, swap meets, and more. [Magnification] The package includes a 60X LED lighted loupe. It helps determine diamond clarity and can also be used for inspecting coins, stamps, reading small text, and other detailed work. [Wide range of use] Jewelry diamond testers have a wide range of applications, including testing diamonds, as well as use in industrial inspection, circuit boards, printing, gardening, education, geography, home, and office tasks. Color: Black Material: Metal Package Contents: 1 x Diamond Tester Set Note: Light and screen display differences may cause slight variations in the color shown in the image compared to the actual item. Measurement may vary by +/- 1-3 cm.