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The ping test (to me) is literally as simple as placing the silver coin on top of your first finger & thumbnail area and flicking it off your thumbnail into the air. Nothing to it and no extra tools needed apart from the ones you were born with. A 1 Oz silver coin will make a very clear and beautiful "ping" sound as it twirls through the air. Other ways to test for a silver coin are the obvious size & weight measurements & comparisons, and intriguingly, another one works with a strong neodymium magnet. Hold the coin at 45 degrees or a bit steeper on a flat surface, then place the small strong neodymium magnet at the top and marvel at how it SLOWLY slides down the surface. If you tried the same thing with a UK 5p or 1p coin they would instantly crash to the bottom. Not so with the magnet. Is the magnet attracted to silver? No it isn't. How does this work? The answer is that the (strong) magnet induces eddy currents in the silver as it slides down which then slows its descent. That trick works with pure silver & pure gold coins. It won't work with a Krugerrand because the Kruger isn't pure gold and is alloyed with a small amount of copper. Try it and see for yourselves. Ain't science marvellous. As stated, you must use a neodymium magnet, preferably a small round one shaped like a small coincell. Remember, the more tests your gold or silver coin passes, the more likely it is to be genuine. It is much easier to fake one or the other characteristic of a pure gold or silver coin, but it becomes exponentially more difficult to fake them all.