Practical Tool : Covering acoustic resonance testing and magnetic composition testing , it provides multi factor authentication for gold and silver changes Precise and Professional : Through pristine resonant frequency analysis , it can verify from 1/10 ounce to 10 ounces , meeting certification standards and ensuring professional and reliable authentication results Platform Compatibility : Connects to analysis apps , supports advanced analysis , and automated report generation , ensuring convenient and comprehensive authentication documentation Efficient and Easy to Use : Simply place a change in the included holder to initiate resonance analysis , intuitively identifying authenticity through acoustic characteristics . The magnetic snap on design makes metal composition testing simple and efficient , requiring no special knowledge Pocket Size : Easily fits in your pocket for professional authentication anytime , anywhere , ideal for collectors and merchants verifying, Weight: 0.37368353409 pounds, Manufacturer: Tuidzljd