The measurement of the sebum content consists of a rather basic, direct reading of the sebum secretion on skin, hair and scalp. The measuring is generally taken with a parchment like foil which becomes transparent after contact with lipid substances. The foil is pressed on the skin for a defined period. The change in transparency is then measured with the help of a source of light (photometric method). This method is insensitive to humidity. It is recommended to take sebumeter readings before any product application. Data recording after the cosmetic treatment allows to evaluate the appropriate selection of products. This helps to avoid excessive skin care which leads to a reduction of the natural regenerative activity of the skin.
For a comprehensive instruction manual please refer to: http://www.courage-khazaka.de/. General information on skin diagnosis is available in the following publications (English translation):
| 
