The permanently installed measuring probes and instruments and the hand-held measuring instruments have a precise calibration and offer high accuracy with small measuring tolerances.

These professional humidity meters often differ significantly from the usual commercially available devices and offer both a high working comfort and a very low measuring tolerance.

Apart from the practical disadvantage of the measurement taking a long time, laser Doppler imaging also tends to be affected by motion artefacts leading to inaccurate measurements, particularly in children.