I actually purchased to control the Restfeuchtemestimmung to readiness for covering the floor under construction, the meter, tested ichs on plaster and also on wood, because the readings were plausible only when the screed has me bake the device itself after 4 weeks still 16.8% moisture shown. The measurement of another instrument was then on even 2%, which were also rather plausible. Even on concrete, which is built for 10 years and is in the dry area of an older building shows it's still at 16%. Something is wrong there.
