An apparatus designed by the authors for measuring oxygen tension in biological objects is described. An electronic commutator allows it to close the inlet of the recording system at the instant of interval, to accomplish separate and smooth adjustment of the pulse and interval duration within a wide range. This makes it possible to electively establish the electrodes polarization and depolarization conditions depending upon the electrochemical characteristics of the electrodes, the nature of the biological object and the purposes of investigations, which represents the advantage of the unit over the other known apparatus.
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