These are small, airtight containers which fit exactly onto the respective sensor and form an airtight enclosure around the sensor. The lower screw-on part is then filled with the humidity standard material. The desired humidity level is reached following a settling period of typically 60 minutes at a constant temperature. The equipment can now be adjusted to match the reference humidity value. We offer suitable devices for every ROTRONIC sensor and can also construct an appropriate calibration device for your humidity measurement equipment.