A prototype of our new VH400 probes set was built using the same connection scheme as in Petter’s experiments. Three VH400 probes are wired in parallel (below). The voltage of the joined output is measured using the sensor node in RISERnet. We are testing this prototype, especially its robustness and waterproof performance in field. After the testing, 20 probes set will be produced which will be deployed in Powelltown along with 20 soil temperature sensors. Similar to Petter’s experimental set up, these sensors will be inserted in fuel baskets. We will select the deployment locations carefully in order to study the spatial variation of the measurements of these sensors