The spread of household-sized small power plants and e-mobility makes more and more important a precise, real-time monitoring of the low-voltage section of the power supply system. Comtech has developed the PQM product family for this purpose. It's elements allow creating long-term statistics as well as finding quickly the existing and potential fault locations. The available device configurations provide outstanding flexibility in adapting to the measurement environment - scalable software capabilities, replaceable modem with LTE/Cat-M/GSM communication, external or built-in antenna and outdoor housing make measurements possible in almost any environment.