Monitor of X, r and hard ray. The Geiger Counter enjoys a high flexibility and can measure the environmental background. 2 kinds of detection methods, 3 kinds of alarm mode and a variety of alarm threshold. 24H monitoring allows users to check anytime and anywhere The average dose rate is displayed at the same time Permanent data storage upon power cutoff. Graphic LCD and maximum screen. Low power consumption and battery under-voltage indication function. The instrument can preset the alarm valve value of dosage rate and accumulative dosage.Technical index: 1.Detection ray: X, r and hard ray 2.Detector: Energy compensation GM pipe (Geiger counting pipe) 3.Measurement scope a.Dosage equivalent rate: 0.01~1000 Sv/h (maximum: 10 mSv/h) 4.Energy scope: 50 keV~1.5 MeV 30 % (as for 137 Cs I) 5.Relative innate error: 15 % (137 CS 1 mSv/h) 6.Flexibility: 80 CPM/Sv/h (as for Co60) 7.Alarm valve value: a.Dosage rate: Selection among 0.5, 1.0, 1.5, 2.0, 2.5, 5.0, 10.0, 50.0, 100.0Sv/h at disposal. b.Unit of dosage rate: Sv/h 9.Measurement display: The dosage rate is displayed per second; the protection alarm response is less than 5 seconds. 10.Utilization environment: Temperature: - 10 oC ~ + 45 oC ; Relative humidity: 95 % (+ 45 oC) 11. Power source: Two No. 5 (AA) batteries or charging batteries