<p> </p> <p>Nuclear radiation detector Geiger counter X γ β-rays with real-time mean cumulative dose modes.</p> <p>Screen is easy to read with good information &amp; has an internal Geiger–Müller tube with sound alarm.</p> <p>No batteries are included.</p> <p>Real-time dose: (update once every second to quickly display the true value of each moment, characterized by large fluctuation &amp; high consistency with sensor detection results. <br>The real-time value is automatically tested &amp; displayed without operation after boot. (Unit: usv/h)</p> <p>Mean dose (AVG): Records the total dose received over a period of time &amp; converts it into the mean display, characterized by small fluctuation to check the background value of the environment and weak radiation environment. Press the M button to recalculate the mean value. (Unit: usv/h)</p> <p>Cumulative dose (ACC): adds all the detected doses, &amp; the data will not be lost after shutting down, historical data will continue to be accumulated after booting up again, &amp; 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)</p> <p>Specifications:</p> <p>Material: ABS<br>Colour: black<br>Model: XR1<br>Detectable types: β, Y, X rays<br>Energy ranges: 20kev-3.0 Mev ≤±30%(137Cs-)<br>Sensitivity: 80cpm/μsv/(Co-60)<br>Test accuracy: 0.01μsv/h<br>Real-time ranges: 0-99.99μsv/h<br>Cumulative ranges: 0-99.999msv<br>Real- time error: ≤10%<br>Mean error: ≤3%<br>Power supply: 3*1.5V batteries or 1.2V rechargeable batteries (NOT INCLUDED)</p>