An especially advantageous construction of a turbine arrangement is suggested for a device for measuring a water current by a turbine arrangement (TE) through which the water current flows and in which a turbine housing surrounding the rotor (RO) is constructed from only two housing parts (GT1, GT2) with the identical form. The structural parts of the turbine arrangement are advantageously held against each other in a non-detachable manner and in a preferred further development there can be a locking position of the turbine arrangement in a simple manner with a rotor that is positively prevented from rotating.
