Electromagnetic flowmeter comprising - a measuring tube for guiding a flowable medium, wherein the measuring tube has a wall; - at least three measuring electrodes (3, 4, 11, 12), which are arranged in the wall, for forming a galvanic contact with the flowing medium in each case; - at least one magnetic field generating device for generating a magnetic field passing through the measuring tube, and - a measuring circuit which is set up to determine at least one first measured variable, wherein measured values of the first measured variable are determined at a first pair of measuring electrodes, - an evaluation circuit, which is set up to determine a Reynolds number and/or a kinematic viscosity value of the medium in the measuring tube by means of measured values of the first and a second measured variable, which differs from the first measured variable, wherein measured values of the second measured variable are determined at a second pair of measuring electrodes or at a third measuring electrode in relation to a reference potential, wherein the measuring electrodes (3, 4, 11, 12) are arranged in the measuring tube such that, during a test measurement, quotients of current measured values of the first and second measured variables correspond bijectively with the Reynolds number of the flowing medium in the measuring tube at least in a Reynolds number range of 10 000≤Re≤100 000. - a measuring tube for guiding a flowable medium, wherein the measuring tube has a wall; - at least three measuring electrodes (3, 4, 11, 12), which are arranged in the wall, for forming a galvanic contact with the flowing medium in each case; - at least one magnetic field generating device for generating a magnetic field passing through the measuring tube, and - a measuring circuit which is set up to determine at least one first measured variable, wherein measured values of the first measured variable are determined at a first pair of measuring electrodes, - an evaluation circuit, which is set up to determine a Reynolds number and/or a kinematic viscosity value of the medium in the measuring tube by means of measured values of the first and a second measured variable, which differs from the first measured variable, wherein measured values of the second measured variable are determined at a second pair of measuring electrodes or at a third measuring electrode in relation to a reference potential, wherein the measuring electrodes (3, 4, 11, 12) are arranged in the measuring tube such that, during a test measurement, quotients of current measured values of the first and second measured variables correspond bijectively with the Reynolds number of the flowing medium in the measuring tube at least in a Reynolds number range of 10 000≤Re≤100 000. wherein measured values of the second measured variable are determined at a second pair of measuring electrodes or at a third measuring electrode in relation to a reference potential, wherein the measuring electrodes (3, 4, 11, 12) are arranged in the measuring tube such that, during a test measurement, quotients of current measured values of the first and second measured variables correspond bijectively with the Reynolds number of the flowing medium in the measuring tube at least in a Reynolds number range of 10 000≤Re≤100 000.