Magnetic-inductive flow measuring probe which can be inserted into a pipe through which a medium flows, comprising - a housing, wherein the housing has a housing wall; - at least a first and a second measuring electrode (4, 5), which are arranged on the housing wall, for forming a respective galvanic contact with a flowing medium; - at least one magnetic field generating device for generating a magnetic field passing through the housing wall, wherein the magnetic field generating device is arranged in the housing; 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 measured between two measuring electrodes or at a measuring electrode in relation to a reference potential, - an evaluation circuit which is set up to determine a Reynolds number and/or a kinematic viscosity value of the medium in the pipe 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 between two measuring electrodes or at a measuring electrode in relation to a reference potential, wherein at least one measuring electrode set up for determining the measured values of the second measurand differs from the measuring electrodes set up for determining the measured values of the first measurand, wherein the measuring electrodes are arranged on the housing wall in such a way that, during a test measurement, quotients of current measured values of the first and the second measured variable correspond bijectively with the Reynolds number of the medium in the pipe at least in a Reynolds number range of 10,000≤Re≤100,000. - a housing, wherein the housing has a housing wall; - at least a first and a second measuring electrode (4, 5), which are arranged on the housing wall, for forming a respective galvanic contact with a flowing medium; - at least one magnetic field generating device for generating a magnetic field passing through the housing wall, - at least a first and a second measuring electrode (4, 5), which are arranged on the housing wall, for forming a respective galvanic contact with a flowing medium; - at least one magnetic field generating device for generating a magnetic field passing through the housing wall, wherein the magnetic field generating device is arranged in the housing; and - a measuring circuit which is set up to determine at least one first measured variable, - a measuring circuit which is set up to determine at least one first measured variable, wherein measured values of the first measured variable are measured between two measuring electrodes or at a measuring electrode in relation to a reference potential, - an evaluation circuit which is set up to determine a Reynolds number and/or a kinematic viscosity value of the medium in the pipe by means of measured values of the first and a second measured variable which differs from the first measured variable, - an evaluation circuit which is set up to determine a Reynolds number and/or a kinematic viscosity value of the medium in the pipe 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 between two measuring electrodes or at a measuring electrode in relation to a reference potential, wherein at least one measuring electrode set up for determining the measured values of the second measurand differs from the measuring electrodes set up for determining the measured values of the first measurand, wherein the measuring electrodes are arranged on the housing wall in such a way that, during a test measurement, quotients of current measured values of the first and the second measured variable correspond bijectively with the Reynolds number of the medium in the pipe at least in a Reynolds number range of 10,000≤Re≤100,000.