[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 o 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 light and handy, and each comes with a carrying bag. They can be easily placed in your wallet or backpack without taking up much space. They are a must-have kit when going to a garage sale, market, swap meet, etc. [Magnification] The package also includes a 60X LED lighted loupe. It can help determine the clarity of diamonds and can also be used for coins, stamps, reading, inspection, and more. [Wide range of use] Jewelry diamond testers have a wide range of uses, suitable not only for testing diamonds but also for applications in industry, circuit boards, printing, gardening, identification, eon, geography, homes, and offices. Color: black. Material: metal. Package Contents: 1 set x Diamond Tester. Only the above package content is included; other products are not included. Note: Lighting and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement may vary by +/- 1-3 cm.