Works very well, it was very high in my basement, about 33. A radon company came to me and installed a radon shield. They ran their test and I got the machine running at the same time and the results came back and they were within 10-20% accuracy of each other; Both this block and the actual test. So for me a very accurate instrument. I got it because my son-in-law had generation 3 and I had generation 4; same technology, just a different user interface.
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