The devices for geoelectric measurements include various tools such as a GeoTom, resistivity probes, non-polarizable probes and electrode cables of various lengths for surface and downhole application. A sandbox model (diameter and height 0.6 m) is employed for miniaturized geoelectric measurements. The optoelectronic laboratory provides a suitable development peripheral to create system solutions based on optical, electronical and mechanical components and thus to support the engineering work …