The following measuring principles are covered: capacitive, piezo-resistive, thermal, inductive, fluidic, and optical. To generate optimal signals at the measurement location and to be able to process them further as best as possible, we also develop the matching readout electronics for the solar cell. Short ways from laboratory to production: We can rely on various in-house manufacturing and construction techniques, such as silicon technology, micro die casting, or various molded interconnect device (MID) techniques. Powerful systems are available for testing and characterizing the reliability of sensors.