I'm no expert, but ...

... The unit is relatively small, light and very easy to use. On the basis of being sent with uranium glass plate you can check the functionality of the device. Otherwise it would be a bit difficult. I have to say Fortunately. It shines in my direct environment namely virtually not at all. In the attached description tells how (he) can M (inute) Convert in Sievert or in Bequarell the C (ounts) P. This really is not difficult. The display makes for me at low radiation doses little sense. Since you can better count the pulses over a certain period and then count. The display shows the (predicted) pulses per minute. This of course makes no sense, if so only in a blue moon minute times comes a pulse.

If you're feeling like it's happened to me before you buy, then you're thinking: Man, a Geiger counter one can use the doubts already. What if times explodes a nuclear power plant in Europe? Did they indeed formerly not thought of Japan that such a thing happens. Russia, Ukraine - clear. But in a high-tech country? But 200 Euro are of course a lot of money for something that you just might need time.
Dear doubters - what convinced me to buy was the thought that 200 euros in the worst case just a tiny pile of worthless paper is compared to what this unit can then do a. Men may shake their heads when you say you bought a Geiger counter. Okay. But the same people are guaranteed in the worst-case scenario at the vegetable counter right behind you when you check up the products. Or would you prefer to rely on the official data and controls? It has been seen in Japan, as the measures have looked like - who simply increases the allowable limit value, when the old limits were no longer tenable.
The quick check of goods in the supermarket is with this unit by the way no problem. The unit is ready for immediate use and also the power supply is a 9V extremely comfortable.
I had the device worth the money. A Geiger counter is one of the products in which it is better to have one and not need it than to need one and to have none.