Thermo-hygrographs for example, are being used for continuous recording for temperature and relative humidity.
Important application areas:


Climatic measuring sizes (temperature and humidity) are transferred from the measuring element via a lever mechanism and the writing arm to a diagramm. The timely sequence of measuring values can be checked any time by the curves from the diagram.
Registering is done by electronic drives controlled by quartz on diagrams for running sequences of either 1, 7, or 31 days.
The devices are delivered without additional cost for a 7/30-day recording sequence. Switching is very simple.
All devices are delivered secure for transportation together with diagram paper, long hand, and battery.