Includes acoustic resonance testing and magnetic composition detection for multi factor verification of gold and silver changes . Compatible with mainstream verification systems , meeting comprehensive authentication needs Place the changes in the included stand to resonance analysis , authenticate authenticity intuitively through sound characteristics . Magnetic buckle design enables simple and efficient metal composition testing , no professional expertise needed Pocket Pinger Uses pure resonance frequency analysis to verify changes ranging from 1/10 ounce to 10 ounces . Complies with certification standards , ensuring professional and reliable authentication results Coin Tester Connects with changes analysis apps , supporting advanced analysis and automated report generation . Conveniently stores complete authentication documents for record keeping Easily fits in pockets , enabling professional grade authentication anytime anywhere . Ideal for collectors and merchants needing on site changes verification, Weight: 0.65367060683 Pounds, Manufacturer: Ounfhtrttk