Features: Professional Authentication Instrument: This compact verification set utilizes acoustic assessment technology with measuring tools, assessing items from small fractional pieces to larger 10 oz specimens. Designed for collectors and merchants needing exact metal composition and dimensions verification. Advanced sound Frequency assessment: Check silver/gold items through detailed resonance assessment. Multi Purpose Connectivity: Easily connects with common item assessment applications including Metal Verification Program and Authentication Service, enabling thorough inspection and automatic record keeping. Portable Measuring Solution: The 4 inch by 5 inch protective case contains efficient detectors for quick substance recognition. Complete Verification Tools: Combines sound assessment, magnetic testing, and size measurement in single package. Perfect for jewelry stores, antique experts, or individual collectors requiring effective professional authentication. Specifications: Substance: ABS Size: Portable design, pocket-friendly characteristics: Lightweight, permanent, easy to carry Technical parameters: High- precisions sensor｜Quickly detects coin material｜Supports multiple currency types Usage scenarios: jewelry store | antique market | individual collection appraisal Package Includes: 1 Pocket Coin Tester set note: Before testing, please that the surfaces of the coin is clean, dry and of to avoid affecting the resonant frequency and detection accuracy.