The human eye is very sensitive to the distinction of colours viewed side by side. But, as soon as they meet the eye separately, differences can often not be detected. Furthermore, the impression the eye receives from colours depends on the ambient lighting. 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 haemoglobin (erythema). Many international scientific studies demonstrate its benefits in all important dermatological and cosmetological application fields.

Assessing Melanin Content Erythema Level
The Measuring Principle
The measurement is based on absorption/reflexion. The probe of the Mexameter® MX 18 emits 3 specific light wavelengths. A receiver measures the light reflected by the skin. The positions of emitter and receiver guarantee that only diffuse and scattered light is measured. 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 also specific wavelengths are used, corresponding to the spectral absorption peak of haemoglobin and to avoid other colour influences (e. g. bilirubin). The results for both parameters are immediately shown as index numbers.
The Probe
The modern, high quality electronics of the probe allow a very quick measurement. A spring in the measuring head provides constant pressure on the skin. Its low weight ensures easy handling. 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.
The resolution of the measuring results is higher than in the previous model the Mexameter® MX 16. The Mexameter® MX 18 shows the melanin and erythema values in a range from 0-999.

Check Calibration
The new technology of the probe does not require frequent, complicated and time consuming recalibration. The accuracy of the probe can be checked any time with a special tube.
Technical Data
Dimensions: 13 cm x 2.4 cm Measuring surface: 5 mm 19.6 mm² Probe cable: 1.3 m Weight: 85 g incl. cable
Wavelengths: 3 colour measuring system green: ë = 568 nm, red: ë = 660 nm, infrared: ë = 870 nm
Accuracy: ± 5%
Technical changes may be made without prior notice.