I have a radon chamber and can run your testing devices alongside a RAD7,a few active monitors,Electret ion chambers and charcoal cannisters and let you know how they all compare. As of right now this is for R&D only. The cost is just $175.00.
For training purposes we have installed a FESTA fan in the radonschool. The fan is tapped into our radonchamber for venting purposes.  ​
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