FIELD: measurement technology. SUBSTANCE: invention is aimed at determination of presence of current conductive material in granules or liquid phase at point of positioning of probe. Measurement probe includes first electrode separated from second one by electric insulation porous gas-penetrable material, means to drive gas through gas-penetrable material and means to couple first and second electrodes to source of power supply when gap between electrodes is electrically closed by means of current conductive material. EFFECT: increased operational efficiency. 14 cl, 3 dwg
