Corneometry
Corneometry is a non-invasive analytical technique used to assess the water content of the stratum corneum, the outermost layer of the skin. The method relies on measuring the dielectric properties of the skin with a probe, most commonly via capacitance-based devices known as corneometers. In these instruments, the water content of the stratum corneum alters the dielectric constant of the tissue, which changes the electrical capacitance read by the probe. The result is typically expressed in arbitrary units that correlate with skin hydration levels.
Standard practice involves placing the probe on a clean, moisturization-free area (commonly the volar forearm or
Corneometry is widely used in dermatology, cosmetic science, and pharmaceutical development to evaluate skin hydration and
Limitations include that corneometry mainly reflects surface hydration and may not reflect deeper skin water content.
The technique became widely adopted in the late 20th century with commercial corneometers used in research