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. According to the customer request units are equipped with Monicor-2M corrosion meters (for operating in the autonomous recording of corrosion rates) or Monicor-3-GSM-LPR (for taking measurements and transmitting them to the Web server in real time). Such units can be used at high temperatures, provided that the pressure is under 25 atm.