Comparison of different instruments for measuring stratum corneum moisture content

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Abstract
Stratum corneum moisturization was measured by two instruments simultaneously on the same subjects at different body sites. One instrument is based on the 1 GHz focused microwave dielectric measurement; the other instrument measures impedance at 16 Hz. A linear relationship r = 0.86 was observed between the measurements by the two above-mentioned instruments. The 1 GHz focused microwave measurement is more accurate in measuring water concentration in the stratum corneum, especially in the upper layers relevant to ''moisturization''; it is, however, an expensive research instrument. The low frequency impedance measurements involves a much simpler, cheaper and portable instrument which can be used routinely to evaluate ''moisturization'' for the purpose of skin classification under field conditions.