Feature 1Real Time Measurement: Real time measurement of dose rate, and at the same time record the accumulated dose and the average value of the interval. 2Sound and Light Alarm: Dose rate alarm broad value, measurement alarm reading value can be set by key, with super measurement alarm function, sound and light alarm. 3Clear Display: White light display design, clear display, night can also be normal reading, convenient for your use. 4Fault Indication Function: Nuclear radiation detector has sensor fault indication function, the display can be measured continuously after automatic hibernation 5ABS Material: Geiger counter is made of ABS material, wear resistant and durable, not easy to damage, can be used for a long time.SpecificationItem Type:PenTypeNuclearRadiationDetectorMaterial: ABSWeight: Approx. 94g / 3.3ozSensor: 48mm Geiger Counter TubeMeasurement Range: 0.08uSv to 50mSvMeasurement Accuracy: -17%~+25% based on 137Cs Operating Environment: Temperature -20C to 50C,Humidity