Woot offers Generic Detect Fake Silver Coins | Silver Coin Balance for $9.99 (orig. $25.99). Free shipping for Prime Members.

Product Description:
The Silver Coin Balance employs dimensional analysis and weight measurement technology, allowing it to scrutinize the physical attributes of coins with accuracy. By comparing these measurements against established standards, the device effectively identifies any deviations that will indicate counterfeit or altered coins. 

• Measure your coin's Thickness, Diameter, and Weight (2 times) to ensure authenticity
• Test the following Silver Coins: Eagle, Brittania, Philharmonic, Maple, Krugerrand, Kangaroo, and Asahi Buffalo Round
• The Silver Coin Balance is EXACT,therefore it's not uncommon for authentic coins to be tight fitting. Also, to make sure the tests are accurate, align the coin in the center of the balance portion
• This device has been designed to streamline the authentication process, allowing you to swiftly and accurately verify the authenticity of your silver coins with minimal effort.
• Enjoy verifying your silver!