Main technical indicators: 1. Detect rays: y, X and beta rays 2. Detector: Energy compensation CM tube (Geiger counter tube), low energy response is improved 3. Normal content standard 0.5µSv/h 4. Measuring range a. Dose equivalent rate: 0.01~1000µSv/h (Max. 10mSv/h) b. Cumulative dose equivalent: 0.01µSv/h~500.0 mSv 5. Energy response: 50KeV~1.5MeV≤± 30% (for 137CS-) 6. Sensitivity: 80CPM/µSv/h (for Co-60) 7. Alarm threshold: a. Dose rate: Optional at 0.5, 1.0, 1.5, 2.0, 2.5, 5.0, 10.0, 50.0, 100.0µSv/h b. Cumulative dose: Optional at 0.05, 0.5, 1.0, 2.0, 5.0, 10.0, 20.0, 50.0, 100.0 mSv/h. Measurements show that the dose rate is displayed per second and the protective alarm response is less than 5 seconds 9. Operating environment: temperature -10~+45, relative humidity: ≤ 95% (+45) 10. Product size: 189*70*30