【Portable Design】: Pocket Coin Ping Pinger Test Kit is compact and lightweight, making it easy to carry and verify gold and silver coins. 【Scientific Principle】: Coin Ping Test uses a resonance test to detect material differences in gold and silver coins, capturing the coin’s resonant sound and frequency for enhanced accuracy. 【Easy Operation】: Gold and silver coin ping testing is easy to use, requiring no complex setup; simply tap to complete the test. 【Widely Compatible】: This ping testing tool is suitable for a variety of precious metal coins, including gold, silver, commemorative, and collectible coins. 【Material】: The test tool is made of stainless steel and aluminum alloy, ensuring long-term durability. It is ideal for coin collectors, investors, and precious metal enthusiasts. Size: 12 cm x 3.5 cm (4.72 in x 1.38 in) Package Includes: 1 Coin Ping Pinger Test Kit Note: Please allow for slight measurement variations of 1–2 cm (0.39–0.79 in) due to manual measurement.