Since 1980 the Corneometer® has provided a well established method to determine reproducibly and accurately the hydration level of the skin surface. It is the world’s best selling skin hydration measurement device. This is documented by the numerous mentions in dermatology and cosmetology literature in which the terms “corneometry” and skin hydration measurements are inseparable. The accuracy of other hydration measurement instrumentation on the market is always assessed against the standard of the Corneometer®.

The Measuring Principle
The measuring principle of the Corneometer® CM 825 is based on capacitance measurement of a dielectric medium. Any change in the dielectric constant due to skin surface hydration variation alters the capaci- tance of a precision measuring capacitor. One of the greatest advantages of the capacitance measurement method, compared to other measurement methods, is the fact that products applied to the skin only have minimal influence on the measurements. The measurement can detect even slightest changes in the hydration level. The reproducibility of the measurement is very high and the measurement time is very short (1 s). Due to the construction of the measuring head, the measurement depth is very small (in the first 10-20 µm of the stratum corneum).

The Probe
The modern, high quality electronics of the probe provide temperature stability and exclude interference of the base capacity and power supply fluctuations with the measurement. A spring in the probe head ensures constant pressure on the skin, enabling exact, reproducible measurements which do not influence the skin. The low weight of the probe and the small measuring surface (49 mm²) allow easy handling, measurements on all body sites and simple cleaning after the measurement.

All calibration data are inside the probe. Thus the probe is completely self contained and can be connected to different device types. It is also a significant advantage for quick and easy servicing of the probe.

Check Calibration
The new technology of the probe does not require frequent, complicated and time consuming recalibration. The accuracy of the probe (calibration values and penetration depth) can easily be checked any time. Continuous measurements directly on the skin or indirectly, with a small air chamber on the probe head, are possible. An ambient condition sensor to measure the relative humidity and temperature of the environment can be connected to the system.
Technical Data
Dimensions: Length: 11 cm Weight: approx. 41 g, Probe cable: approx: 1.3 m, Measuring surface: 49 mm²
Measurement principle: capacitance, Measurement frequency: 0.9-1.2 MHz, Accuracy: ± 3 %
Technical changes may be made without prior notice.