NMR spectrometers used in catalysis research vary in terms of magnetic field strength and probe capabilities. High-field NMR spectrometers (typically 400 MHz and above) provide high resolution and sensitivity, which are essential for detecting subtle changes in chemical environments. Specialized probes, such as Magic Angle Spinning (MAS) probes, are employed for solid-state NMR studies, which are particularly useful for examining heterogeneous catalysts and surface interactions.