The service includes testing the correct operation of a photovoltaic module using a dedicated meter for photovoltaic installations - the Sonel MPI540 PV. The use of a dedicated device allows us to relate the actually measured current and voltage parameters to STC conditions, which gives the possibility of direct comparison with the data given in the data sheet by the manufacturer. In addition, using a Sonel KT-256 thermal imaging camera, the photovoltaic module is verified for the presence of so-called hotspots, taking into account the guidelines of the respective module manufacturer. The service also includes the repair of bypass diodes if they are found to be damaged by the customer or at the stage of verification of the photovoltaic module's electrical parameters.