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Frequency dependency of the skin-electrode contact impedance measured on the same subject (and on the same spot in the forearm) on two different days (A,B), using 20 electrodes each session. (C,D): positioning of the electrodes for the impedance characterization and electrical scheme, respectively. The Ztattoo has been evaluated against the parallel of five commercial electrodes (Zcomm) in order to make the latter negligible and thus having a more accurate measurement.
