Measuring device and method for local measurement of at least one electrical property of the content of a container

Measuring device for local measurement of at least one electrical property of the content of a container, comprising:

• at least three electrodes disposed adjacently of each in a direction with a vertical component and electrically insulated from each other, wherein each of the electrodes is adapted to be connected to an electrical measuring circuit for measuring, via one of the at least three electrodes and at least one other of the at least three electrodes which is connected to an electrical earth, the electrical property of the content of the container in the vicinity of the electrode connected to the measuring device and the at least one electrode connected to the electrical earth, wherein
• the electrical measuring circuit is adapted to generate at least one electric measuring signal representing the measured electrical property;
• a control unit for connecting at least one of the at least three electrodes to the electrical measuring circuit and connecting at least one other of the at least three electrodes to the electrical earth,
• characterized in that
• the control unit is adapted to connect to the electrical earth at least one other electrode adjacent to the first electrode, and to insulate the remaining electrodes from the electrical measuring circuit and the electrical earth.