Mexameter® MX 18


Assessing Melanin Content and Erythema Level


The 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

    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 heamoglobin 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.
    • 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.


  • Fields of Application

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


    • Many international scientific studies demonstrate its benefits in all important dermatological research and cosmetological application fields.
    • It is indispensable in efficacy testing and claim support for cosmetics and pharmaceuticals (especially sunscreen and skin whitening products)
    • 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.

  • 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, Wavelengths: 3 colour measuring system green: λ = 568 nm, red: λ = 660 nm, infrared: λ = 870 nm,  Units: arbitrary Mexameter® units (0-999 for melanin and erythema), Measurement time: 1 s, Accuracy: ± 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.


Dpro Scientific Sdn. Bhd.

B-08-03, Dataran 32,

No. 2 Jalan 19/1, 46300,

Petaling Jaya, Selangor,



Dpro Scientific Pte. Ltd.

35, Tannery Road,

#02-07 Ruby Industrial Complex,

347740 Singapore.



Tel      +6(03) 7960 4710

H/P     +6(012) 2175277