Feature: 1. Efficient and Portable: This nuclear radiation detector is designed to be compact and portable, allowing for quick and accurate detection of radioactivity in marble. 2. Multifunctional: In addition to marble testing, it can also be used for measuring Geiger counters and ionizing radiation, catering to various detection needs. 3. Accurate Alarm: Equipped with an alarm function, radiation monitor can promptly emit warning signals to ensure users receive the latest and accurate radiation information. 4. User Friendly: Radiation monitor meter features easy to operate buttons and an intuitive display screen, making it suitable for both ordinary individuals and professionals. 5. Widely Used: Widely applied in the environment where existing ionize radiation. Such as home improvement radiation, geological survey, iron, Inspection vehicles, nuclear power plants, industry, radiology, radiology laboratories and so on Specification: Item Type: Nuclear Radiation Detector Material: ABS Weight: Approx. 232g / 8.2oz Power Requirement: 2 x AA Batteries (Not Included) Function: The detector can preset dose rate and cumulative dose alarm thresholds Detected Radiation: X ray, R ray, and hard β ray Detector: Energy compensated Geiger tube Measurement Range: Dose Equivalent Rate: 0.01-1000 uSv/h (maximum dose: 10 mSv/h) Energy Range: 50 keV-1.5 MeV (30% deviation with 137Cs) Relative Inherent Error: ±15% (137Cs, 1 mSv/h) Sensitivity: 80 cpm/uSv/h (e.g. Co-60) Alarm Thresholds: Dose Rate: 0.5, 1.0, 1.5, 2.0, 2.5, 5.0, 10.0, 50.0, 100.0 μSv/h. Package List: 1 x Nuclear Radiation Detector1 x English User Manual Note: See the instructions for details.