Features:_x000D_ Portable Size: The small size of this tool is very convenient for every use, you can carry it in your tool bag without taking up too much storage space._x000D_ Real-time dose(REAL): Update once every second to quickly display the true value of each moment, characterized by large fluctuation and high consistence with sensors detection results. The real-time value is automatically tested and displayed without operation after boot. (Unit: usv/h)_x000D_ Mean dose(AVG): Record the total dose received over a period of time and convert it into the mean display, characterized by small fluctuation and convenience to check the background value of the environment and weak radiation environment. Press the M button to recalculate the mean value. (Unit: usv/h)_x000D_ Cumulative dose(ACC): That is, add all the detected doses, and the data will not be lost after shutting down, and historical data will continue to be accumulated after booting up again, and there will be a long-term cumulative sum value. You can press L button and R button simultaneously to clear cumulative value. (Unit: msv/h)_x000D_ Wide Applications: This nuclear radiation detector can be widely used in nuclear physics, environmental monitoring and industrial fields._x000D_ Specifications:_x000D_ Material: ABS_x000D_ Color: white, black (optional)_x000D_ Detectable types: , Y, X rays_x000D_ Energy ranges: 20kev-3.0 Mev 30%(137Cs-)_x000D_ Sensitivity: 80cpm/sv/(Co-60)_x000D_ Test accuracy: 0.01sv/h_x000D_ Real-time ranges: 0-99.99sv/h_x000D_ Cumulative ranges: 0-99.999msv_x000D_ Real- time error: 10%_x000D_ Mean error: 3%_x000D_ Power supplys: 3*1.5V batteries or 1.2V rechargeable batteries (NOT INCLUDED)_x000D_ Package size: 110 * 70 * 35mm / 4.3 * 2.8 * 1.4in_x000D_ Package weight: 131.5g / 4.6ounce_x000D_ Packing list:_x000D_ 1 * Nuclear Radiation Detector