models     FAQs    • technical bulletins    • calculators    • procedures    • frequent questions     parts     general         technical information           = Discontinued or Obsolete - Polaragraphic Oxygen concentration derived from a proportional current flow between the anode and cathode in an electrochemical cell.  7001   7001D   7002D   7003D   7003M   OXYNOS 100  ROX/GP  ROX/GT