uwe-arnsberg from team Wetter-Board has some quite high readings on his sensor, especially compared with one official from the vincinity:
R@H-diagramm:


Official BfS-diagramm:


Has he set the "experimental" flag or are this real readings?
Or, if you're reading this post yourself, Uwe, where is the detector placed? Is it in your basement counting Radon emissions?
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Gruesse vom Saenger