Radiation Dosimeter with LCD Display X γ β Rays Detector Handheld Geiger Counter Radiation Monitor NR‑850 Item Type: Radiation Detector Model: NR-850 Detection Ray: γ, X and hard β rays Detector: Energy compensated Geiger counter tube, improved low energy response Normal Content Standard: Within 0.5uSv/h Measurement Range: Dose Equivalent Rate: 0.00-1000μSv/h (maximum 10mSv/h) Cumulative Dose Equivalent: 0.00μSv-500.0mSv Energy Response: 48KeV-1.5MeV ≤±30% (for 137Cs-) Relative Inherent Error: NR-850 Type, ≤±10% (137CS1mSv/h) Sensitivity: 80CPM/uSv/h (for Co-60) Alarm Threshold: Dose Rate: 0.5, 1.0, 1.5, 2.0, 2.5, 5.0, 10.0, 50.0, 100.0μSv/h arbitrary selection Cumulative Dose: 0.05, 0.5, 1.0, 2.0, 5.0, 10.0, 20.0, 50.0, 100.0mSv arbitrary selection Measurement Display: Dose rate displayed per second, protective alarm response less than 5 seconds Usage Environment: Temperature -10℃-45℃, Relative Humidity: ≤95% (+45℃) Battery: 2 x AA Battery (battery not included)