The Ringer & Silver Coins

The Ringer can also be used to check 1oz silver coins and Silver Dollars as a different composition of metal/s used to make a fake will give a different ring tone to that of a genuine coin.
Having said that, the fake 1oz silver coins we have checked and those that have been reported are too thick and will be detected by the Fisch. This emphasizes the necessity of using the Ringer as well as the Fisch to check a coin.
https://www.thefisch.com/whyitworks#ringer_principle