Specification: Item Type:NuclearRadiationDetector Model: FJ2000 Material: ABS Color: As Pictures Shown Weight: Approx. 95g / 3.4oz Power on or ff: Long Press the ON Button in the Controller Product Size: Approx. 92x55x18mm / 3.6x2.2x0.7in (Length x Width x Thickness) Function: GM Counter Tube, Measure X Ray or Ray Display: Range: 4 Digit LCD Cumulative Dose Equivalent: Hp(10)0.0Sv-99.99mSv Dose Equivalent Rate: Hp(10)0.1Sv/h-99.99mSv/h Response Time: 3s Mute Function: Yes Dose Rate Response: <20% (1Sv/h-99.99 mSv/h) Energy Response: <30%(48KeV-1.3MeV) Relative Inherent Error: <15% (137Cs) Alarm Functions and Alarm Thresholds: Preset alarm thresholds for dose rate and cumulative dose within the measurement range. The instrument now has fixed alarm thresholds as follows: (1)Cumulative dose: for every increase of 0.1Sv, a short beep will sound and a light will be emitted; if the cumulative dose is greater than or equal to 50Sv, an acousto-optic alarm will appear once, and ALARN will be displayed. (2) Dose rate: Dose rate 25Sv/h, continuous sound and light alarm, with ALARM display. (3) Blocking alarm: When the counting tube is blocked, the continuous alarm will not stop, and there will be ALARM and BLOCK display. The alarm sound intensity is about 80dB at 30cm. Package List: 1 x Nuclear Radiation Detector 1 x English Manual 1 x Storage Bag