Courage + Khazaka electronic GmbH

FAQ - Scientific Devices

General Questions on the Scientific Measurements

mpa2 Quadrat

 

FAQ for Scientific Skin Measurements

How often do my probes need calibration?

Does the "check calibration function" in the software calibrates my device?

What should I do if my probe is out of tolerance during a study?

How long do I have to wait between the measurements?

What value is "normal" for the different measurements?

Does the season play a role for my study, even though I have the volunteers acclimatized 30 minutes?

Some key information on what to consider in an efficacy study with bioengineering instruments

Which instrument to use for which claim?

What is the general difference between devices for the skin type analysis and cosmetic recommendation and the scientific laboratory devices?

 If any of your questions is not listed in the FAQs, please read the corresponding instruction manual thoroughly or This email address is being protected from spambots. You need JavaScript enabled to view it.. Also please look in the instruction manual for more detailed explanations about cleaning of devices and probes, error messages and description of the measurements.

In case your equipment needs to be send in to the service, please get in contact with the service before you send anything in. You will get detailed instruction on what to send in and how to send it.

How often do my probes need calibration?

Kalibrierzertifikat

The probes are high precision measurement tools. We recommend sending the probes to the manufacturer or an authorized agent every year for a complete calibration. You will get a calibration certificate for each probe, which is also important for your internal documentation. The pH-probe is an exception from this, as it needs frequent calibration by the user according to the operation instructions.

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Does the "check calibration function" in the software calibrates my device?

No, recalibration of your probes has to be performed by the service as sophisticated high precision tools are needed. The check calibration function however, allows you to check the accuracy quickly and easily any time to ensure that your probe is working properly. This is important to do before conducting a mayor study. The only exceptions are the Skin-pH-Meter, the mexsondkalSkin-Visiometer®, the Visioscan® and the Visioline® which have to be calibrated by the user from time to time.

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What should I do if my probe is out of tolerance during a study?

That depends on how much out of tolererance the probe is. If the deviation is only a slight one, it is recommendable to first finish the study with the very probe before sending it in to keep all data more comparable. If the deviation from the tolerance however is high, the probe will need recalibration. Please tell the service that you need it back asap and we will do our best to help you.

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How long do I have to wait between the measurements?

Once one measurement is executed (result seen on the display or in the software) the probe is immediately available for the next measurement.

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What value is "normal" for the different measurements?

The parameters will differ a lot due to the skin site, age, gender, ethnic group, season and so on. The measurements are normally used to compare before and after applying a products/treatment to monitor changes.

Does the season play a role for my study, even though I have the volunteers acclimatized 30 minutes?

Yes, try to keep a study within one season. At least avoid seasons with extreme heat or humidity  for measurements on hydration and TEWL.

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Some key information on what to consider in an efficacy study with bioengineering instruments

Literature:

Buch FluhrPractical Aspects of Cosmetic Testing - How to Set up a Scientific Study in Skin Physiology

Fluhr, Joachim W. (Ed.)1st Edition., 2011, XI, 272 p. 27 illus., 14 in colour., Hardcover ISBN: 978-3-642-05066-4

This book is indispensable for all scientific skin testing in the laboratories of the cosmetic industry. In it you will find all our experiences working in the field of skin testing devices for almost 25 years. It offers a wide range of elementary knowledge and practical advice on how to perform efficacy tests. All authors are recognized experts in their field. It is available in the Springer publishing house and directly from C+K for a special price, just contact us.

 

 

  • Definition of the protocol: (aim, time, test type, volunteers, parameters & devices)
  • Short term effects (e.g. increasing moisture for 12 hours) vs. long term effects (e.g. reduces wrinkles in less than 3 weeks). Avoid short time evaluation if product needs many applications to be effective (e.g. anti-wrinkle products, elasticity improving products, etc.). For short term effects: Standard and single application of product, repeated measurements after the application of the product (e.g. after 30 min, 1 h, 2 h, etc.), control area. For long term effects: in use test (with a good protocol on how to use etc.), repeated applications (usual condition of use), control areaTestlabor
  • Seasonal changes for parameters
  • Influence of temperature, humidity on results of the tests
  • Select subjects according to specific inclusion and exclusion criteria (age, sex, health state, skin problems). Small number of subjects can affect result due to non significant data (optimally more than 20).
  • Subjects must acclimatize to the lab condition (optimally 20-22°C and 40-60 % r.h.)
  • Control site (reference/untreated)
  • Do not measure immediately after having applied a product.
  • Randomizing areas and products
  • Blind and double blind study
  • Selection of area (reproducible way)
  • Periodic instrument calibration
  • Choice of the statistical analysis

Interesting information, guidelines, regulations and laws regarding tests of cosmetic productsEEMCO

The European Expert Group of Efficacy Measurement of Cosmetics and Other Topical Applied Products EEMCO

The European Cosmetic Care Association: Cosmetics Europe (previously COLIPA) www.cosmeticseurope.eu

Intensive Course in Dermato-Cosmetic Science by Prof. Vera Rogiers at the Free University of Brussels: http://dercoscourse.vub.ac.be/info.shtml

Australia's first Diplomas in Personal Care and Cosmetic Science: www.personalcarescience.com.au

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Seasonal changes for parameters
Influence of temperature, humidity, 

   on results of the tests

 

Subjects must acclimatize to the lab condition (optimally 20-22°C and 40-60 % r.h.)

Which instrument to use for which claim?

Here are some examples of which devices can be use in different efficacy testings:

RESTORING, REPAIRING, PROTECTIVE, SOOTHING: Tewameter®, Colorimeter® , pH-Meter, Corneometer®, Skin-Thermometer®, Visioscan®, Visiometer®, Mexameter®, Corneofix®, Sebumeter®, Sebufix®

SUNSCREEN, WHITENING, ANTI-DARK  SPOTS, ANTI-AGE SPOTS: Mexameter®, Colorimeter®

HYDRATANT, NOURISHING, MOISTURIZING: Corneometer®, Corneofix®, Visioscan®, Sebumeter®, Sebufix®, MoistureMap

DECONTRACTING, TONIFYING, FIRMING: Cutometer®, Corneometer®, Visioscan®, Cutiscan

ANTI-WRINKLE, FILLER EFFECT,  RESTRUCTURING, REMODELLING, REJUVENATION, ANTI-AGE: Cutometer®, Reviscometer®,,  Visioline®, Visiometer®, Visioscan®, Cutiscan, MoistureMap

Helps to relieve....

...CELLULITE, ...STRETCHMARKS, ...COUPEROSIS: Cutometer®, Reviscometer®, Visioscan®, Colorimeter®, Skin-Thermometer®, Cutiscan

...ACNE, ...DANDRUFF: Visioscan®, Sebumeter®, Glossymeter®, Visiopor®, Sebufix®, pH-Meter, DandruffMeter

...SENSITIVE SKIN: Tewameter®, Mexameter®, Skin-pH-Meter, Corneometer®, Meibometer®

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What is the general difference between devices for the skin type analysis and cosmetic recommendation and the scientific laboratory devices?

The devices for the skin type analysis derive from the scientific measurement methods known for many years and used all over the world for clinical studies and efficacy testing. However, the skin type analysis devices have a less accurate resolution, where they express the sebum content e.g. in "dry", "normal", "oily", the scientific Sebumeter® shows the sebum content in a high precision figure to monitor even smallest changes in the sebum level. The scientific devices possess check calibration tools and facilities and software to support the statistical gathering of data. The skin type analysis instruments are not recommended to use for clinical studies but to increase the sales of cosmetic products and promote certain treatments to the customer.

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