The invention discloses a pressure electrolyzer comprising a pressure vessel and an electrolytic-cell block arranged in the pressure vessel and containing a plurality of electrolytic cells combined in the form of a stack. The shutter includes a perimeter framework that is adapted to receive a transparent impact resistant member. This take places through the use of an identification registrar and an identification valuator. The probe tips have electrically conductive outer ends configured to mechanically and electrically engage conductive contact surfaces of a circuit substrate to be probed. The number of defects per an area of the sample are found as a result of the first scan, and the position of one or more of the found defects is determined from the second scan.