Use the included measuring card to accurately check your coin's diameter against certified standards for authenticity verification. Includes keychain magnet tester to quickly determine metallic composition-genuine silver and gold show minimal magnetic . Designed for silver and gold coins, this kit combines resonance testing, magnetic composition checks, and precise size measurement for reliable multi-factor verification. Secure your coin in the included holder, release, and compare the clear resonance against authenticity standards-ideal for detecting with ease. design for easy carrying and on-the-go testing. Compatible with Precious Coin Tester, Pingcoin, and Coin Tester apps for advanced analysis., Weight: 0.50044933474 pounds, Manufacturer: Jaywool