A Coriolis mass flow measuring device 100 includes four bent measuring tubes 110a, 110b, 110, 110dd, two actuator arrangements 140a, 140c, and two sensor arrangements 142a-1, 142a-2, 142c-1, 142c-2, wherein all four measuring tubes (110a, 110b, 110c, 110d) are joined inlet end and outlet end with collectors (120), wherein the measuring tubes are connected inlet end and outlet end pairwise with node plates 132a, 132c, 134a, 134c to form oscillators, wherein the actuator arrangements 140a, 140c are adapted to excite bending oscillation wanted modes between the two measuring tubes of an oscillator, wherein the first oscillator and the second oscillator have bending oscillation wanted modes with first and second wanted mode eigenfrequencies (f11, f12), wherein the magnitude of the difference of the wanted mode eigenfrequencies of the two oscillators (|f11−f12|) amounts to at least 0.1 times, for example, at least 0.2 times and especially at least 0.4 times the lower of the two wanted mode eigenfrequencies, wherein the sensor arrangements are adapted to register oscillations of the oscillators.