Great product. Initial readings are fast and accurate. After finding readings up over 600 Bq/m2 in the room with the sump pit I moved it to another area of the basement and found the readings were much lower. With the door closed between the 2 areas readings went down even further. After getting a quote for abatement and talking to the estimater he gave the radon eye his approval sighting it’s accuracy. The reading it gives are useful and the graph is helpful as well. It is easy to set up and use. The statistics could be improved with over all averages, high and low readings and adding weather info to the graph. Using the data I had I was able to lower my readings to just over 200 BQ/m2 with a sump pit cover while I wait for the weather to improve so I can install a radon evacuation system to lower the readings below the World Health Organizations recommendation of 100 Bq/m2. Great product I recommend it for every home owner as radon readings change over time.