The oxygen diffusion meter measures the mobility of oxygen in the soil. A mobility that is important for the availability of oxygen for plants.  The method: measuring the electric current required for the reduction of all oxygen present at the surface of a cylindrical Pt-electrode in the soil. The flow of oxygen through the air-filled pores and the water film on the electrode is measured until the steady state is reached.

Accuracy +/- 3 μA and +/- 3 mV. Operating temperature
between 0 and 50 °C and an air humidity between
30 - 80%. The meter is supplied in a case, incl. batteries.