Precious Coin Tester 对比 Sigma Mini 的使用情况和统计数据

Test precious metal contents in gold coins and silver coins: - Over 600 free coins available now! - Access 2000+ coins with high-precision results! - Full-text search through a massive up-to-date database of over 40,000 coins! - Customize your own coin parameters—tailor every detail! When you get a silver or gold coin with correct weight and size, how can you know it is not a fake coin made of other cheap materials? Traditional ping tests can distinguish true gold or silver coins from counterfeit ones in cheap metal. But you need good ears! Precious coin tester helps you listen to the sound generated by the ping test and will tell you whether the coin is a cheap metal fake. So no more worry about the fake gold or silver coin! How to ping the coin? Hold the coin on the tip of one finger near the mic of your phone/tablet, and knock the coin briefly with another hard object. Hold still the coin while it rings. When the sound of coin has diminished, knock it again. Tutorial video: https://youtu.be/iWIJ7Ke50-M Which results are good? Both 2 and 3 stars are good results: - 2 star offers standard/traditional ping test result, it indicates that the sound of the coin matches that of a genuine one. It is a qualitative result. - 3 star is our uniquely developed high precision result, it indicates metal content error is under 10% for silver and under 5% for gold. Spot a 3-star false positive and you may win a $100 reward! Details: https://preciouscointester.com/en/3_star_quest/round2/3_star_quest.html - Want more details? Please visit https://preciouscointester.com/en/ Your suggestions and comments are highly welcome! *The result is only for informational propose, all decisions made based on this information are at users' own risks.