Get a brief overview of the Original Sigma, the Sigma Pro Mini and the full size Sigma Pro
Basic training video for the use of Sigma Metalytic's Precious Metal Verifier. This device uses radio waves to detect the metal type in coins and bullion and can identify counterfeits.
CoinWeek: Precious Metal Verifier Available to Help Determine Genuine Gold & Silver Items
The Precious Metals Verifier by Sigma Metalytics is a great tool to test silver rounds and coins.
General tips on testing with the Pro