I purchased a second radon testing company who used 1027's and 1028's. I use femto so am seilling them. There are 16 - 1027's and 10 - 1028's. All calibrated in 2020, a few in January/Feb. Happy to get more details to you if you are interested.
source https://www.inspectorsjournal.com/topic/18750-radon-monitors/?do=findComment&comment=172348
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