A device for measuring at least one property of a material sample is disclosed. The modified stainless steel alloy consists essentially of, in weight percent, about. 6, a hardness HsB of the bead filler is not less than 65 and not more than 80, and the hardness HsR of the side reinforcing layer is not less than 75 and not more than 85, a size relationship between the hardness HsB and the hardness HsR is HsB\u2266HsR, a value TB of tan \u03b4 is not more than 0. The apparatus further comprises at least one oscillator disposed external to the enclosure, where each oscillator is interconnected to a different electromagnetic energy radiator.