This video provides an overview about the EU H2020 NanoPAT project. It explains why the characterisation of nanoparticles is crucial for manufacturing processes, which are the main features of conventional characterisation technologies and which novel technologies are being developed in NanoPAT to overcome the shortcomings of the traditional ones. Furthermore, the scope of the project, the 3 real-time in situ particle size characterisation (Photon Density Wave Spectroscopy (PDW), OptoFluidic Force Induction (OF2i), TUrbidity Spectrometry (TUS)), as well as the 5 case studies where the technologies will be validated are presented.