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 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) 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. the M button to recalculate the mean value. (Unit: usv/h) Cumulative dose(ACC): That is, add all the detected doses, and the data not be lost after shutting down, and historical data continue to be accumulated after booting up again, and there be a long-term cumulative sum value. You can L button and R button simultaneously to clear cumulative value. (Unit: /h) Wide Applications: This nuclear radiation detector can be widely used in nuclear physics, environmental monitoring and industrial fields. Detectable types: β, Y, X rays Energy ranges: 20kev-3.0 Mev ≤±30%(137Cs-) Sensitivity: 80cpm/μsv/(Co-60) Test accuracy: 0.01μsv/h Real-time ranges: 0-99.99μsv/h Cumulative ranges: 0-99.999msv Real- time error: ≤10% Mean error: ≤3% Power supplys: 3*1.5V dry batteries or 1.2V rechargeable batteries (NOT INCLUDED) Colour:black Material:ABS Size: 106 x 70 x 30mm Package Contents: 1 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.