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We've actually used the First Alert radon test twice now. The first time was to get an initial radon amount and then a follow up test after we had someone come in and fit a radon mitigation system in the basement. The company that did the work followed up with their own lab test from another lab company to show how much the radon had come down. Because we wanted to confirm the results (or because we are either untrustiong or simply dubious) we got another First Alert test kit and did the post test again. The results were within .1% of the company's test so there was good verification. Incidentally The First time we tested we were showing 7.8 pcl and the second test, after mitigation, showed .7 pcl, so we were happy all around.