Features: Professional nuclear radiation detector adopted GM(Geiger Miller) detection technology is adopted to the real-time radiation detection. Built in Geiger counter to enhance detection sensitivity, the error is small, and the measurement response speed is less than 1 second. There is an alarm sound when the radiation exceeds the standard. With the function of nuclear radiation detection, real-time dose detection, average value automatic calculation, cumulative dose automatic storage. Portable designed Geiger counter with palm-size is easy to use and carry around. Battery operated Geiger nuclear radiation detector is powered by 3pca AA batteries(Not include), low power consumption. Specifications: Color: Black / White (Optional) Material: ABS Sensor Type: Energy compensation type GM tube Detectable Type: , , and X rays Energy Range: 20kev-3.0mev30%(137Cs-) Sensitivity: 80cpm/usv(Co-60) Test Accuracy: 0.01usv/h Real-time Range: 0-99.99usv/h Cumulative Range: 0-99.99usv/h Real-time Error: 10% Mean Error: 3% Real-time Response Time: Less than 1 second Power Supply(NOT included): 3 * 1.5V AA battery or 1.2V rechargeable battery Charge: USB5V/2A input Charge Time: 2-4 hours Item Size: 105 * 70 * 30mm / 4.13 * 2.76 * 1.18in Item Weight: 102g / 3.61oz Package Weight: 133g / 4.70oz Package Size: 11 * 7.5 * 3.5cm / 4.33 * 2.95 * 1.38in Packing List: 1 * GM Counter