Fig. 2. Layout of the redox–temperature probe. (A) Three-dimensional view. (B) Layout of probe, without the sensors placed. The probe consists of a Perspex tube, with holes drilled in it for the temperature sensors. At the same depths, Pt wires are placed on the outside of the probe, slightly sunken into the tube ensuring minimal damage to the soil profile when the probe is pushed into the soil. The pointed tip is glued to the tube. All sensors and Pt wires are connected to the Hypnos datalogger with isolated computer cable (connecting wires not shown).