Both meters in this category measure without destroying anything: the device is held against the surface and the result appears in a few seconds, with no drilling and no sample taken. Both reach 30 mm deep and need material at least 30 mm thick - with a thinner layer whatever lies underneath enters the measurement.
The humimeter GE1 is a device for one job: checking the moisture of a floor before a covering is laid. It measures up to 10 % water content and carries five curves - screed, screed CM, concrete, anhydrite screed and the dimensionless digit scale. It converts the reading into CM percent automatically, though the manufacturer states that these are guide values and do not replace a measurement by the CM method. In practice the GE1 searches the surface and points out the wettest places, and the decisive CM measurement is then made only there.
The humimeter GF2 is a meter for the whole site. It measures up to 20 % water content, carries more than a dozen curves - aerated concrete, plasterboard, brick and clinker among them - logs up to 10 000 measurements and accepts external probes for air humidity, infrared temperature or a ram-in electrode.
Where the moisture of a structure has to be followed over weeks rather than checked once, there is the huminode IoT LW: a wireless sensor with an electrode driven into the material, sending its readings to a dashboard over LoRaWAN.
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