Courage + Khazaka electronic GmbH

Scientific Devices

Mexameter® MX 18

Assessing Melanin Content and Erythema Level

Mexamater face with ring startThe Mexameter® MX 18 is a very easy, quick and economical tool to measure the two components, mainly responsible for the colour of the skin: melanin and hemoglobin (erythema) by reflectance. There are many fields of application where changes in the skin colour are of interest. The instrument is worldwide established and used in many scientific studies.



The Measuring Principle

Advantages of the Mexameter®

Fields of Application

Technical Data


The Measuring PrincipleMexameter principle

The measurement is based on absorption/reflection. The probe of the Mexameter® MX 18 emits 3 specific light wavelengths. A receiver measures the light reflected by the skin. As the quantity of emitted light is defined, the quantity of light absorbed by the skin can be calculated. The melanin is measured by specific wavelengths chosen to correspond to different absorption rates by the pigments. For the erythema measurement specific wavelengths are also used, corresponding to the spectral absorption peak of haemoglobin and to avoid other colour influences (e. g. bilirubin).


Advantages of the Mexameter®

  • Very quick and easy measurement (1 second for the two results: melanin index and erythema index).
  • Continuous measurements over a longer period can optionally be performed.
  • The highly sensitive measurement gives values on a broad scale (0-999) for melanin and erythema so that even smallest changes in colour become traceable.
  • The probe is small and lightweight for easy handling and measurement on all body sites.Mexameter probe
  • A spring in the probe head ensures constant pressure on the skin enabling exact, reproducible measurements.
  • The accuracy of the Mexameter® probe can be checked easily anytime.
  • The probe head can easily be cleaned after each measurement.
  • Worldwide established and used in many scientific studies.

 Mexameter probe armMexameter faceMesswerte


 Fields of Application:

There are many fields of application where changes in the skin colour are of interest.Sonnencreme

  • Many international scientific studies demonstrate its benefits in all important dermatological basic research and cosmetic application fields.
  • It is indispensable in efficacy testing and claim support for cosmetics and pharmaceuticals (especially sunscreen and skin whitening products, skin soothing)
  • In occupational health the skin irritation (erythema value) is of special interest to show the necessity of skin protection measures.


The Mexameter® MX 18 is available as a stand-alone device or connectable to the MPA systems or as a wireless probe.

Please also read Frequent Asked Questions on the Mexmeter®.


Brochure Download

Technical Data

Probe only:

Dimensions: 13 cm x 2.4 cm Ø, Measuring surface: Ø 5 mm ≈ 19.6 mm², Cable length: approx. 1.3 m,  Weight: 85 g (incl. cable)

Measurement principle: absorption/reflection, Nominal wavelengths: 3 colour measuring system green: λ peak = 568 nm, red: λ peak = 660 nm, infrared: λ peak = 880 nm,  Units: arbitrary Mexameter® units (0-999 for melanin and erythema), Measurement time: 1 s, Measurement uncertainty: ± 5%

For the dimensions, etc. of the wireless probes, please see the technical data of the basic devices.

Technical changes may be made without prior notice.



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