The objective of this paper is a proof of concept on the possibility to measure the same magnetic fields, by the principle of dilation invariance. According to this principle, dilation of the dimensional and electrical parameters of a probe and a plate with crack reproduces the same magnetic field (measured at every dilated point) which was produced by a probe and a plate with crack, without dilation. This implies that, in order to evaluate the performance of eddy current method in a specific industrial case study, one can carry out tests in a scaled model in the laboratory and then, extend the conclusions to the real situation by using dilation invariance principle. The experimental and simulation results show a good agreement of crack detection by using two eddy current probes of which one is the dilated version of the other.