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[ LED lights and audio indication]: With LED lights and audio indication, the jewelry diamond testers can diamond (green light) metal alarm (a continuous buzzing sound when the user accidentally touches the metal instead of the stone.[Fast results]: This jewelry tester will get fast results when you have it set right; Green indicator will be showed on Diamond Selector II if the stone is a real diamond. It will make continuous buzzing sound when user accidentally touches metal rather than stone.[Compact size]: With light weight ABS material and compact size design, the diamond tester is easy to carry and storage.[Protect ways]: Wear a protective cover when not in use. If the battery is low, replace it in time to ensure accurate detection. Please remove the battery if the instrument is not used for a long time

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