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Both the PT 100 RTD temperature sensor and the Humidity sensor WA-1 used in the probe and associated electronics are very stable and should not require any calibration after the initial factory adjustment. Long term stability of the ROTRONIC Hygromer humidity sensor is typically better than 1 %RH per year. For maximum accuracy, calibration of the probe should be verified every 6 to 12 months. Applications where the probe is exposed to significant pollution may require more frequent verifications.
See more information here in the AwEasy FAQ:
Depending on the conditions of measurement, the wire mesh dust filter (model W24) should be checked from time to time. Corroded, discolored or clogged filters should be replaced.