NMR‐absorption signals in a 2‐cm3sample of glycerol can be observed in a small permanent magnet producing a field of 50 mT. Observing the beat frequency between the marginal oscillator used as spin detector and the Larmor frequency of the spin system after excitation with 10‐ to 20‐ μs high‐frequency pulses, the free‐induction decay and spin echoes can be detected. The experiment is capable of demonstrating the principles of NMR tomography, e.g., the Carr–Purcell sequence, inversion recovery, and image formation in a field gradient.