The primary aim of this technical report is to present NMXP2MSEEDpy, a free open­source software based on Python programming language. NMXP2MSEEDpy allows the conversion of the data stream from the NMXP format, used by the Nanometrics Libra instrumentation, to miniSEED data format. The main goal was to create a system that could rehabilitate the use of Nanometrics Libra instrumentation, which although dated, is still fully functional and performing, but is now being decommissioned also due to the obsolescence of the proprietary Nanometrics software used for the acquisition and storage of seismic data. For this reason, it was decided to use the miniSEED format for data management. In fact, it is currently fully supported by the most used data acquisition, storage and processing software...