All you need is a scale, a strong magnet, and a good ear. When I buy rolls from eBay I weigh every coin. I also look at feedback. That ping test is retarded and a good way to ruin a coin (if you care about numismatic crap). All it takes is to hear it fall over on a counter and bounce around on its face. I find that silver coins don't ring very much. They sound like plastic. They sound fake compared to circulated clad coins if you're just getting into metals. Clad coins ring a lot. The opposite behavior dictated this video.
Please come join my forum if you're not a trendy and agree with my points of view.
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