Efficient & 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 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 Pocket Size: Easily fits in your pocket for professional authentication anytime, anywhere, ideal for collectors and merchants verifying, Weight: 0.3747858454 pounds, Manufacturer: Aboiled