Abstract <p>A comparative analysis of the results of experimental measurements of the field dependences of the specific magnetization of permanent magnets with different magnetization reversal mechanisms by means of magneto-optics and magnetometry is presented. It is shown that the values of the relative specific residual magnetization σ_r, measured by the vibrating sample magnetometer method, correlate well with the values of the relative residual magnetization <i>M</i>_мo obtained from magneto-optical images of magnets using an indicator bismuth-containing ferrite-garnet film. It has been experimentally established that for permanent magnet samples with different geometric shapes and sizes, there is a difference in the course of the graphs σ_r(<i>Н</i>) and <i>M</i>_мo(<i>Н</i>), which is related to the shape factor of the samples. For all samples, the value of the reverse field, after exposure to which a demagnetized state is achieved, according to magneto-optics data, coincides with the value obtained during magnetic measurements using a vibrating sample magnetometer.</p>