Vernier calliper

can use for fast calculation and conversion of the relative or absolute humidity, water content and dew point in the high- and low humidity area. 

It should not be missing during a measurement.
For example: If known gas temperature and water content
fast read off on the slide the dew point and the relative humidity.

Six conversion tables:

1. partial pressure - water vapour content
2. absolute humidity  - dew point temperature
3. dew point temperature - relative humidity
4. wet bulb temperature - dew point temperature
5. partial pressure - dew point temperature
6. pressure - absolute humidity.