Feature: 1. EFFICIENT PORTABILITY: This compact nuclear radiation tester is designed for easy carrying and delivers fast and precise detection of radioactivity in marble, providing accurate and reliable results. 2. VERSATILE FUNCTIONALITY: In addition to testing marble, it can also measure Geiger counter and ionizing radiation, meeting a wide range of testing requirements with exceptional accuracy. 3. ALARM SYSTEM: Equipped with a highly responsive alarm function, it promptly alerts users with warning signals, providing the latest and most accurate radiation information for enhanced safety. 4. USER FRIENDLY DESIGN: Featuring intuitive buttons and a clear display, this radiation detector is perfect for both novices and professionals, offering easy operation and convenience in usage. 5. DURABLE USE: Crafted from ABS materials and subjected to rigorous testing and quality control, this durable nuclear radiation tester provides long term and dependable performance for reliable use. Specification: Item Type: Radioactive tester Material: ABS Weight: Approx. 66g / 2.3oz Battery: 1 x 9V 6F22 li ion battery or batteries with the right voltage and connector(not included). Package List: 1 x Radioactive Tester1 x English Manual