【Portable Design】: Pocket Coin Ping pinger Test Kit is compact and lightweight, making it easy to carry around and verify the gold and silver coins 【Scientific Principle】: Coin Ping Test uses a "ping resonance test" to detect material differences in gold and silver coins, quickly identifying . It clearly capturing the coin's resonant sound and frequency, providing enhanced accuracy 【Easy Operation】: Gold Silver Coin Ping Testing is easy to use, requiring no complex setup; simply tap to complete the test 【Widely Compatible】: Gold and Silver Coin Ping Testing Parts is suitable for a variety of precious metal coins, including gold, silver, commemorative, and collectible coins 【Material】: Test Tool is made of stainless steel and aluminum alloy, ensuring long term durability and durability. It's ideal for coin collectors, investors, and precious metal enthusiasts Size Chart: 12cmx3.5cm/4.72inchx1.38inch Package Includes: 1 Coin Ping pinger Test Kit Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.