Courage + Khazaka electronic GmbH

FAQ - Scientific Devices

Corneometer®

CM Quadrat

FAQ for the Corneometer®

In what units does the device measure?

What is the penetration depth of the measurement?

When I keep on measuring on the very same skin site, the moisture value is not constant.

What are the main benefits of the capacitance measurement?

Can I measure on hair?

How do the values of the current Corneometer® CM 825 compare to those of the previous Corneometer® CM 820?

Handling Advice for the Corneometer®-probe

 

In what units does the device measure?

The Corneometer® measures in arbitrary units from 0 (no water at all) - 120 (on water). The units have been very wel establishes as so called "Conreometer units".

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What is the penetration depth of the measurement?

The penetration depth of the electric scatter field is demonstrably very small, so that only the moisture on the skin surface is measured. Measurements before and after covering a mecmcalmfolieasuring area with a special foil (15 µm thickness) show that on the foil only 20 % of the original value are measured, the total measurement depth is approx. 40µm. This is important because especially the moisture content in the Stratum corneum is important for cosmetic applications.

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When I keep on measuring on the very same skin site, the moisture value is not constant.

Placing the probe head on the skin for several seconds may cause occlusion under the probe head (i.e. water is collected), thus increasing the moisture value. Also, it could be that the probe was not put straight onto the skin once or the pressure used on the probe was different. We recommend performing 3-5 measurements on adjacent areas and consider the average value. This also helps to minimize influences from artefacts (e.g. a single measurement on a hair, etc.).

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What are the main benefits of the capacitance measurement?

The capacitance measurement of the Corneometer® is the worldwide most used hydration measurement. All other devices are only compared to the Corneometer®. Several hundreds of studies performed with the device prove this fact.CMsondeLippe

  • On the contrary to the impedance measurement by applying the capacitance measurement there is no influence of chemical substances or salts of products which are applied to the skin.
  • The penetration depth of the electrical scatter field is demonstrably very small, so that only the moisture in the stratum corneum is measured.
  • The very short measuring time (1 second when you do a single measurements) prevents occlusion effects which influence the result.
  • Small measuring head allows measurements on all body sites

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Can I measure on hair?

No, the capacitance measurement needs to have complete contact with the supporting surface. However a special Corneometer®-probe for hair is under development. Please contact us for further information.

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How do the values of the current Corneometer® CM 825 compare to those of the previous Corneometer® CM 820?

CM 825The measuring principle is of course the same. With the current model we have only improved the sensitivity of the electronics to make the values of probe even more accurate and reproducible. In tendency the values are the same, but the results of the CM 285 are approx. 20 points lower than those of the CM 820. A multicentric study performed by the mayor German cosmetic companies and some independent testing laboratories in 2000 verified that both probes are measuring accurately the water content of the skin and are absolutely comparable (Source: U. Heinrich et al.: Multi Center Comparison of Skin Hydration in terms of physiacl -, physiological- and product-dependet parameters by the capacitive method (Corneometer CM 825), in International Journal of Cosmetic Science, 2003, 25, 45-53.)..

 

 

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 Handling Advice for the Corneometer®-probe

  • Put it on the skin straight
  • Do not measure on hairy skin
  • Constant but low pressure of the probe head provides stable reproducible measurements ("play" with the probe to see the differnt results for higher and lower pressure with the probe)
  • Measure only for 1 s to avoid occlusion of the skin (except for special applications where you might need continuous measurements).
  • Do not measure on the very same spot again due to occlusion. Make 3 measurements at neighboured areas and use the average.
  • Clean the probe head after each person

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