The invention relates to a fluid flow meter comprising a measuring section for a flow indicator with different measuring methods for flow velocity and fluid flow rate, comprising a housing with an inlet channel, an outlet channel and at least one flow indicator located therein, a housing interior space forming a shape which is complementary to the geometry of the flow indicator, and comprising two bottoms at least partially defining the interior space, and a curved part having a geometry that ensures the formation of a flow, at least one ultrasonic flow indicator being arranged such that the measuring section thereof runs through an inner part of the other flow indicator with another operating mode, and the fluid flow meter comprises an adaptor unit for adapting different diameters of an outlet of the flow indicator and the outlet channel thereof.