The above presented results reflect another important feature of magnetic adaptive testing, too. Namely its multiparametric character. Made one single measurement on the investigated sample a big data pool is generated. The method of magnetic adaptive testing looks for those magnetic descriptors of the varied structural properties, which are best adapted to the investigated property and to the investigated material. It is seen on the above presented figures that different MAT descriptors were used for characterization of material. If any series of samples with the same chemical composition but with different thermal processing was considered, the 1/μij(HBW)-degradation function with parameters (Fi=0, Aj=600 mA) gave good result. Another 1/μij(HBW)-degradation function with parameters (Fi= -700 mA, Aj=725 mA) reflected the hardness if different chemical composition samples with the same thermal processing were considered. It is emphasized again that all of these degradation functions were evaluated from one single measurement. It is important to emphasize that MAT is a relative measurement: in all cases we compare the parameters of measured samples with the parameters of the reference (virgin) sample. For the successful application of the MAT method, first it is necessary to make comparative, traditional, destructive measurements on a series of samples, for “teaching” the MAT. This teaching procedure determines the optimum degradation function/s, and the method of magnetic adaptive testing is best adapted to the investigated task in this way. Then, this/these chosen optimum degradation function(s) will serve as sensitive calibration curve(s) for practical measurements on unknown samples (of the same kind) to be investigated. Obviously different measuring conditions result in different relative sensitivity of the calculated descriptors. Because of this identical experimental conditions should be rigorously kept during measurement of the tested objects, as they were applied during evaluation of the reference samples series. If we do this, the reproducibility of the MAT parameters is excellent even replacing the circuit after longer use in practice, and we detect only the material modification because of the possible wear. The validity of this statement was tested by several control measurements