Portable Size: The small size of this tool is very convenient for everyday use, you can carry it in your tool bag without taking up too much storage space. Real-time dose(REAL): Update once every second to quickly display the true value of each moment, characterized by fluctuation and high consistence with sensors detection results. The real-time value is automatically tested and displayed without operation after boot. (Unit: usv or h) Mean dose(): 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 or h) 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: or h) Wide Applications: This nuclear radiation detector can be widely used in nuclear physics, environmental monitoring and industrial fields. Modle:XR1 Detectable types: , Y, X rays Energy ranges: 20kev-3.0 Mev 30 percent (137Cs-) Sensitivity: 80cpm or sv or (Co-60) Test accuracy: 0.01sv or h Real-time ranges: 0-99.99sv or h Cumulative ranges: 0-99.999msv Real- time error: 10 percent Mean error: 3 percent Power supplys: 3x1.5V batteries or 1.2V rechargeable batteries (NOT INCLUDED) Colour:White Material:ABS Package Contents: 2 x Nuclear Radiation Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.