HABOTEST Nuclear Radiation Pollution Radioactive Marble Detector 1. Detection ray type: beta ray, gamma ray, x-ray 2. Detector: energy compensation GM tube (Geiger counter) 3. Dose equivalent rate: 0.00-50000μ svh (50mSvh) 4. Cumulative dose equivalent: 0.00μ sv - 5000msv 5. Sensitivity: 80 cpm uSv 6. Unit conversion: μSvh, mRh, cps, cpm 7. Battery: 3x1.5V AAA battery (not included) 8. The device uses a Geiger counter, which is an ionizing radiation detector capable of measuring beta rays, gamma rays and x-rays. The working principle is based on the ionizing properties of radiation in the gas. It consists of an ionization chamber or a small room that acts as a detector. When a certain voltage is applied to the detector, the radiation ionizes the gas, producing a pair of ions for each ionization event. This leads to the amplification of the ionization signal, which is then recorded by the electronic device to measure the amount of radiation per unit time. 9. The high-definition backlit large screen provides convenient reading, suitable for use in various environments, and can remain clear even in the dark. 10. Data saving function allows one-click locking of measured values, which facilitates data recording and viewing. 11. Low battery voltage alarm, when the display shows an icon, it prompts that the battery needs to be replaced. 12. Comfortable non-slip grip and compact and portable form. 13. Weight: 118g 14. Dimensions: 140x58x26mm