With a special Tewameter® probe, the boil-off rate of human hair can be measured.
This method enables us to determine the condition of the skin-water-barrier induced by skin-treatments or to determine moisturising effects on hair by hair treatments.
The Tewameter® probe measures the density gradient of water evaporation from the skin/hair indirectly by the two pairs of sensors (temperature and relative humidity) inside the hollow cylinder. This is an open chamber measurement.
The open chamber measurement method is the only method to assess the TEWL continuously without influencing its micro environment.
A microprocessor analyses the values and expresses the evaporation rate in g/h/m2.