Coriolis mass flowmeter with four measuring tubes , particularly curved, at least a first actuator arrangement and a second actuator arrangement, at least a first sensor arrangement and a second sensor arrangement, wherein all four measuring tubes are connected in terms of flow to a collector on the inlet side and outlet side, wherein the first measuring tube and the second measuring tube are connected to one another, on the inlet side and on the outlet side, with at least one rigid gusset plate arranged at a distance from the collector with the aim of forming a first oscillator, wherein the first actuator arrangement is designed to generate a flexural vibration useful mode between the two measuring tubes of the first oscillator, wherein the third measuring tube and the fourth measuring tube are connected to one another, on the inlet side and on the outlet side, with at least one rigid gusset plate arranged at a distance from the collector with the aim of forming a second oscillator, wherein the second actuator arrangement is designed to generate a flexural vibration useful mode between the two measuring tubes of the second oscillator, wherein the first sensor arrangement is configured to measure vibrations of the first oscillator, and the second sensor arrangement is configured to measure vibrations of the second oscillator, wherein the Coriolis mass flowmeter further comprises an operating circuit for driving the actuator arrangements and for recording the signals of the sensor arrangements, characterized in that the first oscillator has a flexural vibration useful mode with a first useful mode natural frequency (f 11 ), and that the second oscillator has a flexural vibration useful mode with a second useful mode natural frequency (f 12 ), wherein the first oscillator and the second oscillator can be mechanically excited independently of one another, wherein the useful mode natural frequency of the second oscillator is greater than the useful mode natural frequency of the first oscillator, wherein the value of the difference between the useful mode natural frequencies of the two oscillators (|f 11 - f 12 |) is at least 0.1 times the useful mode natural frequency of the first oscillator, wherein the operating circuit is designed to drive the actuator arrangements in such a way that the oscillators are each excited with their current useful mode natural frequency, wherein, on account of the good quality of the oscillators, each oscillator is practically only excited at its own useful mode natural frequency, wherein the measuring tubes each have a tube central axis, wherein points of intersection on the inlet side and the outlet side of the central axes of the measuring tubes of an oscillator define a base plane of the oscillator with the front surfaces of the measuring tubes, wherein the measuring tubes of an oscillator have a length (I), wherein the central tube axes of the measuring tubes of the first oscillator - in relation to the base plane of the first oscillator - are arranged to face away from the base plane of the second oscillator at the half pipe length (I/2), and wherein the central tube axes of the measuring tubes of the second oscillator - in relation to the base plane of the second oscillator - are arranged to face towards the measuring tubes of the first oscillator at the half pipe length (1/2), wherein the flow resistance in the measuring tubes of the second oscillator is less than the flow resistance in the measuring tubes of the first oscillator. <EOS>