Be sure to read the instructions or ask a professional to show you how to use. Luckily, I know several jewelers and have dealt with many different types of precious metals and gemstones, otherwise I would have turned down a $10,000 ring thinking it was worth nothing more than its weight in gold. These machines are EXTREMELY sensitive to everything, especially ambient temperature and wind. The instructions on how to use it are very clear, but if you need a better understanding, consult a professional. I took it to my jeweler and he said it works almost as good as the one he spent 50x more on than I did. He also said that the ring sells for 15,000 in stores and I can count on around 10 if I'm in a hurry, which fortunately I'm not. Thank you for selling a product that is not this
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