Abstract: An electrode unit for performing electroporation of a biological cell is provided, including at least one electrode which can contact a cell. A stimulation unit and an impedance measurement device are connected to the cell, respectively to provide signals to provide cell electroporation and to measure the impedance of the electrode in contact with the cell. Further, a memory stores a predetermined value of an impedance parameter of the biological cell, and it is arranged to be readable by a comparing element. The comparing element is configured to compare the value stored in the memory with a value measured with the impedance measurement device, and to produce an adjustment signal to the stimulation unit, forming a feedback loop. The unit is further configured to apply a further electrical signal for providing electroporation of the cell upon receiving the adjustment signal from the comparing element.