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Fast and accurate: The Diamond Tester Pen is equipped with an LED light and audio indication. During the test, the LED lights up if the stone being tested is a diamond, and once our Diamond Tester Pen has completed all tests, the pen will beep as well as display a row of fully lit LEDs..Easy to use: Simply turn on our diamond tester pen detector; place the tip of the diamond tester over the stone (a gentle press is sufficient) and if the stone is fake, crystal or cubic zirconia, the tester will not beep. To determine the clarity of the diamond, use a Loupe, magnifying glass with 60X LED illumination..Multi-functional testing: This gemstone testing device is not only a diamond tester, but also a multi-gem tester. It can detect the authenticity of gemstones including: diamonds, sapphires, rubies, crystals, onyx, emeralds and other gemstones of all sizes..FAST AND SAFE: This diamond selection tester is designed for fast, accurate and safe diamond testing. There is no harm to the diamond. The diamond testing pen is a must-have in your toolbox for garage sales, flea markets, swap meets and more..Applications: industrial use, circuit boards and printing, industry, medicine, horticulture, , diamonds, stamps, jewelry, appraisal, education, geography, home and office.

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