Is it possible to adjust them in case of a deviation?

There is no way for the end user to apply an offset for this device.  However, if you were to send it in for calibration we would be able to apply an offset if one is needed.  In most cases this is rarely needed.

Generally speaking temperature sensors tend to stay fairly accurate over their lifespan.  Humidity sensors will drift a bit due to build up of particulate (dust etc.) on the sensor.  This can be fixed by “baking” the sensor which burns off the particulate and cleans off the sensor.  This is something we can do here during a calibration service or you can do on your own.