Method for non-invasively determining properties of a multiphase flow which comprises a liquid fraction, in particular comprising water and/or a hydrocarbon-containing liquid, and a gaseous fraction and flows through an electrically conductive object, preferably a pipe or a pipeline, wherein the properties of the multiphase flow comprise in particular at least the velocity of the gaseous fraction, the velocity of the liquid fraction, the flow cross-section fraction of the gaseous fraction and/or the water content in the liquid fraction, wherein in the method - using a single set-up having a plurality of EMAT transducers (10a, 10b, 10c, 10d, 12a, 12b, 12c, 12d, 24, 24', 32, 32', 42, 44a, 44b, 44c, 44d, 44e, 44f, 44g, 44h, 48, 50), in particular according to device Claim 24, - at least two signals are spatially correlated with one another for determining the velocity of the gaseous fraction, - at least one signal arising on the basis of a wave reflected from a reflection source in the multiphase flow is evaluated for determining the velocity of the liquid fraction and/or at least one signal arising on the basis of a wave transmitted upstream and coupled at least into a part of the multiphase flow and at least one signal arising on the basis of a wave transmitted downstream and coupled at least into a part of the multiphase flow are evaluated, for determining the velocity of the liquid fraction, and - at least one signal arising on the basis of a wave transmitted downstream or upstream and coupled at least into a part of the multiphase flow is evaluated for determining the flow cross-section fraction of the gaseous fraction and/or at least one signal arising on the basis of a part of a wave transmitted downstream or upstream, said part propagating exclusively in the object wall, is evaluated for determining the flow cross-section fraction of the gaseous fraction. - using a single set-up having a plurality of EMAT transducers (10a, 10b, 10c, 10d, 12a, 12b, 12c, 12d, 24, 24', 32, 32', 42, 44a, 44b, 44c, 44d, 44e, 44f, 44g, 44h, 48, 50), in particular according to device Claim 24, - at least two signals are spatially correlated with one another for determining the velocity of the gaseous fraction, - at least one signal arising on the basis of a wave reflected from a reflection source in the multiphase flow is evaluated for determining the velocity of the liquid fraction and/or at least one signal arising on the basis of a wave transmitted upstream and coupled at least into a part of the multiphase flow and at least one signal arising on the basis of a wave transmitted downstream and coupled at least into a part of the multiphase flow are evaluated, for determining the velocity of the liquid fraction, and - at least one signal arising on the basis of a wave transmitted downstream or upstream and coupled at least into a part of the multiphase flow is evaluated for determining the flow cross-section fraction of the gaseous fraction and/or at least one signal arising on the basis of a part of a wave transmitted downstream or upstream, said part propagating exclusively in the object wall, is evaluated for determining the flow cross-section fraction of the gaseous fraction.