Bruker BioSpin GmbH offers the RheoNMR accessory enabling full RheoNMR measurements made with any compatible Bruker BioSpin NMR spectrometer. The system allows a sample to be placed under rheological stress inside the RF coil in an NMR magnet. A wide variety of shearing and extensional flow cells featuring different geometries are available. The cells are driven by a specialized motor and drive shaft assembly that is controlled by a dedicated hardware interface unit. The RheoNMR accessory is available for wide bore (89 mm) and superwidebore (150 mm) magnets. It consists of a stepper motor, extended shaft and one or more rheometric cells for various shear rates. These parts are mounted into a wide bore shim system and adapted to a Micro 2.5 mm imaging probe with gradient system and a 25 mm ID exchangeable resonator. RheoNMR is making a major impact on studies of mechanical properties of complex fluids, including polymer melts and solutions, lyotropic and thermotropic liquid crystals, micellar surfactant phases, colloidal suspensions and emulsions, biological fluids, foods, and many fluids important in industrial processing and engineering Modification or replacement of the rheo cells by other mechanical structures allow investigations for the characterization of flow and mixing behaviour in a given stirring design, especially of optically opaque disperse media. The typical velocity range is between 0.1 mm/sec and 1000 mm/sec. Mixing and demixing, for instance sedimentation, can be observed and the temporal evolution of chemical/physical reactions in process engineering can be analyzed, e.g. mash process or fermentation.