Is the photovoltaic module optimally aligned? How economically does it operate? Photovoltaic measuring devices can answer these questions in seconds. For example, the perfect angle of inclination can be set and monitored. Testing and maintenance work is carried out in no time and data such as the current-voltage characteristic can be displayed graphically. The internal memory records the evaluations and creates data records. The transfer of data to a computer is made possible via interfaces such as a USB. Robust device designs pay for themselves when used in field operations.