A measuring sensor (2) is based on the fact that the permeability of a magneto-elastic element (11) capable of sensing stress by mechanical means can be detected as a resonance frequency in an electric resonance circuit (10), with the aid of an electromagnetically exciting and receiving system (6). Measuring sensor (2) is designed as an integrated unit which can be simply attached to an object of measurement. The measuring signal can be transmitted in a contactless, position-independent manner.