Nuclear Radiation Detector Monitor High Accuracy LCD Display Portable Handheld Rechargeable Geiger Counter with Alarm Item Type: Radiation Detector Mode: NR 750 Material: ABS 1. Detection Ray: γ, X and hard β radial 2. Detector: Energy compensated GM tube (Geiger counter tube), with improved low energy response. 3. Normal content standard within 0.5uSv/h 4. Measurement Range a, Dose Equivalent Rate: 0.00 to 1000 μ Sv/h (maximum 10mSv/h) b, cumulative dose equivalent: 0.00 μ Sv to 500.0mSv 5. Energy Response: 48KeV to 1.5MeV less than or equal to ± 30% (for 137Cs -) 6. Relative Inherent Error: Model NR 750 less than or equal to ± 15% (137CS1mSv/h) 7. Sensitivity: 80CPM/uSv/h (for Co 60) 8. Alarm Threshold: a. Dose Rate: Within 0.5, 1.0, 1.5, 2.0, 2.5, 5.0, 10.0, 50.0, 100.0 μ Sv/h arbitrary selection b. Accumulated Dose: Selected from 0.05, 0.5, 1.0, 2.0, 5.0, 10.0, 20.0, 50.0, and 100.0mSv 9. Measurement Display: Dose rate displayed per second, protective alarm response less than 5 seconds 10. Usage Environment: Temperature -10 ℃ to +45 ℃ Relative Humidity: Less than or equal to 95% (+45 ℃) Battery: AA x 2 (shipped without battery)