High Precision Diamond TesterProfessional Diamond Selector displays real diamonds or fake diamonds, LCD displays and LED indicators. Compared to the second generation, the sensitivity and accuracy have been significantly improved.Audible and readable alarmsEmits audible sounds to easily distinguish between measurements and portable electronic devices, to distinguish real diamonds from other gemstones simulated. The real diamond is indicated by a red LED and a sound. Test results are accurate, reliable and easy to read. If the stone is a pseudo-crystal, a simulating object such as cubic zirconia (CZ) will not react.Portable DesignDesigned for fast, accurate and safe diamond testing. Thanks to non-destructive testing, operation is simple and precise. The tester is lightweight, compact (credit card size) and easy to carry.VersatileThe tester offers a very compact design, ideal for jewelry shopping, diamond buying/trading, selling real estate, auctions, etc. This diamond tester tells if your jewelry is a real diamond or a fake diamond. The cost of the Diamond Selector III isn't even a fraction of the cost of diamonds, but it can help you feel better knowing you're buying real diamonds rather than fakes. Note: data is all Manual measurements, please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.