The Fisch with the Ringer makes you your own gold expert. Just check the gold coin with the Fisch and the Ringer. If it passes, it is not a common metal or tungsten fake. Used by major banks, bullion dealers and investors in over 70 countries around the world since 1980. Checks the major gold & silver coins – Krugerrand, American Eagle, Maple Leaf, Philharmonic, American Buffalo, US $20, Sovereign, Mexican 50 Pesos, Silver American Eagle, Silver Maple Leaf, Silver Philharmonic, US Silver Dollar and more. The Fisch Tool: The Fisch checks the weight, diameter, thickness and shape of a gold coin. These 4 checks will detect all common metal counterfeits. The Ringer: The Ringer detects tungsten counterfeits. The Ringer detects common metal counterfeits.