can then return to the current return electrode 42 on the pad 43 in addition to the measurement current 47 there may also be a leakage current 47 a going from the current injector electrode 41 to the current return electrode 42 via the metallic body of the pad 43 fig5 shows a further example of a measurement system according to the present disclosure the measurement system includes a pad 53 with one current injector electrode 51 and two current return electrodes 52 attached to a tool mandrel 54 via an arm 55 the current return electrodes 52 are connected via standard electrical connections elements 58 a such as pins wires and the like to a conductive sheet 58 that is positioned between the current injector electrode and the conductive back plate of the pad 53 this increases the capacitance between the back plate of the pad 53 and the current return electrodes 52 while at the same time decreasing the capacitance between the pad back plate and the current injector electrode 51 the impedance zli can be measured with an impedance meter with the terminals connected to the pad back plate and the current injector electrode while the impedance zlr can be measured with an impedance meter with the terminals connected to the pad back plate and one of the two.