Method for bio impedance measurement on a skin surface of a living body, using a bio impedance measurement device having a sensing electrode and a pilot electrode, includes the steps of placing the sensing electrode and pilot electrode on the surface of the body providing a guard electrode adapted to separate the surface in at least two zones, among which a sensing zone including the sensing electrode and a current injection zone including the pilot electrode providing a controller, electrically connected to the electrodes, adapted to control the current source and controlling the potential of the guard electrode, at least at given stopping frequencies, in order to stop current from flowing from one zone to the other.
