[Simple and fast] 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 audio instructions.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 loupe are both light and , and both are equipped with a carrying bag.They can be put in your wallet or backpack without taking up a lot of space.They are a must-have kit when you are going to a garage , market, swap meet, etc.[Magnification]The package also contains a 60X LED loupe .It can determine the of diamonds, and can also be used for coins, , reading, inspection, etc.[Wide range of use]Jewelry diamond testers has a wide range of uses, not testing diamonds, also for industry, circuit boards and printing, gardening, identification, education, geography, homes and officecolour: blackMaterial: MetalPackage Contents:1 set x Diamond TesterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing.The measurement allowed error is +/- 1-3cm.