Bests & Worsts Reviews from Amazon

The first thing I did is a test. And it worked! A test was to see how this Geiger Counter works around the house, at work (major construction project) and with geological samples I know to be slightly radioactive (natural granite, for example). It works. It does exactly what is promised and you can see the Geiger reacting to its surroundings in real time (a small graphic is pictured on the side of the screen). Pros: The price is much lower than anything else I've seen on the market. Almost any other Geiger is circa 400 dollars. Seriously. This one takes active readings, vibrates (or clicks) if those readings are higher than the threshold level. Has background lighting so you can see the screen in a dark basement, and measures in new micorsiverts as well as in roentgens (the ones I'm more familiar with). Sensitive to the materials I have tested it on. Cons: It is not initially clear which way the batteries should be inserted. Apparently both AAAs should be facing the same way - the + side up (which is unusual). Also, there is a graphic on the side of the screen in the shape of a square that keeps drawing the lines as the Geiger is taking readings. You get the most accurate reading after 40 seconds or so when the entire square is drawn out. This took some trial to understand and is not apparent from he manual. Conclusion: a solid, rugged little instrument that is inexpensive and does the job right. I have tested it back and forth and so far I'm happy with the results. A solid recommendation.