LPR probe units for high for high pressure water conduits were developed and approved in 2002 during a field testing at PJSC "Orenburgneft". The units are installed on shut-down pipelines. The units are provided with a ferrous sulfide short circuit protection system. The units may be optionally equipped with Monicor-2 corrosion gages (for standalone recording of corrosion rate) or Monicor-1 units (for individual corrosion rate measurements). Such units can be used at high temperatures, provided that the pressure is under 25 atm.