scope:

This Standard specifies procedures and instruments for the measurement of relative humidity (RH) in air in outdoor or indoor environments. It indicates how RH can be directly measured or how it can be calculated from air temperature, wet-bulb temperature and dew-point temperature. This standard contains recommendations for accurate measurements of ambient conditions and moisture exchanges between air and artworks. It is addressed to anyone in charge of environmental diagnostics, preservation, conservation or maintenance of buildings, collections or single objects.