Both the Epsilon and the MoistureMap (CK Technology sprl, Belgium) are contact imaging devices.
Both the Epsilon and the MoistureMap use semiconductor fingerprint sensors. Both the Epsilon and the
MoistureMap are based on L'Oréal SkinChip research, eg [1-2].
The big difference between the Epsilon and the MoistureMap is its linear
and calibrated response.
This uniquely enables the Epsilon to make quantitative capacitance-related measurements such as
skin or hair hydration. By contrast, CK recommend
that the MoistureMap should be used for visualisation only and that a Corneometer® should be used
alongside the MoistureMap for quantitative measurement.
As for the rest, see below.