[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] 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] Diamond detector and 60X LED lighted loupe are both light and handy, and both are equipped with a carrying bag. They can be placed in your wallet or backpack without taking up much space. They are a convenient kit for use at garage sales, markets, swap meets, etc. [Magnification] The package 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 other purposes. [Wide range of use] Jewelry diamond testers have a wide range of applications, suitable not only for testing diamonds but also for use in industry, circuit boards, printing, gardening, identification, eon, geography, home, and office. Color: Black Material: Metal Package Contents: 1 set x Diamond Tester Note: Light and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement may have an error of +/- 1-3 cm.