Vibronic-type transducer for a fluid flowing through a pipe, said transducer comprising: - a curved measuring tube, which vibrates during operation, and which is designed to convey the fluid, said measuring tube communicating with the pipe via an inlet pipe element which opens into the inlet side and an outlet pipe element which opens into the outlet side, - a counter-oscillator which oscillates during operation in an opposite phase in relation to the measuring tube, said counter-oscillator being mechanically connected to the measuring tube -- by means of a first coupler on the inlet side, and -- by means of a second coupler on the outlet side - an exciter arrangement designed to make the measuring tube and the counter-oscillator vibrate at an exciter frequency f exc, - a sensor arrangement designed to sense vibrations of the measuring tube at the inlet and outlet side, - wherein an inner part, which is formed at least by the measuring tube, the counter-oscillator, the exciter arrangement and the sensor arrangement provokes in a pendular manner around an imaginary longitudinal axis (A 1) of the transducer that is essentially aligned with the inlet and outlet pipe elements (11, 12), -- a rotation of the first and second coupler (31, 32) around the longitudinal axis (A 1) and -- at least partially an elastic deformation of the inlet and outlet pipe element (11, 12), said elastic deformation being essentially torsional characterized in that in order to obtain as soft a rotation as possible in the pendular movement of the inner part at least the first coupler is sized in a manner that is adapted to the torsional rigidity of the inlet pipe element, and at least the second coupler is sized in a manner that is adapted to the torsional rigidity of the outlet pipe element, such that - an inherent, inlet-side natural torsional mode of the first coupler and inlet pipe element has a natural frequency f 1 approximately equal to the excitation frequency f exc, and - an inherent, outlet-side natural torsional mode of the second coupler and outlet pipe element has a natural frequency f 2 that is essentially equal to the natural frequency f 1. - a curved measuring tube, which vibrates during operation, and which is designed to convey the fluid, said measuring tube communicating with the pipe via an inlet pipe element which opens into the inlet side and an outlet pipe element which opens into the outlet side, - a counter-oscillator which oscillates during operation in an opposite phase in relation to the measuring tube, said counter-oscillator being mechanically connected to the measuring tube -- by means of a first coupler on the inlet side, and -- by means of a second coupler on the outlet side -- by means of a first coupler on the inlet side, and -- by means of a second coupler on the outlet side - an exciter arrangement designed to make the measuring tube and the counter-oscillator vibrate at an exciter frequency f exc, - a sensor arrangement designed to sense vibrations of the measuring tube at the inlet and outlet side, - wherein an inner part, which is formed at least by the measuring tube, the counter-oscillator, the exciter arrangement and the sensor arrangement provokes in a pendular manner around an imaginary longitudinal axis (A 1) of the transducer that is essentially aligned with the inlet and outlet pipe elements (11, 12), -- a rotation of the first and second coupler (31, 32) around the longitudinal axis (A 1) and -- at least partially an elastic deformation of the inlet and outlet pipe element (11, 12), said elastic deformation being essentially torsional characterized in that in order to obtain as soft a rotation as possible in the pendular movement of the inner part at least the first coupler is sized in a manner that is adapted to the torsional rigidity of the inlet pipe element, and at least the second coupler is sized in a manner that is adapted to the torsional rigidity of the outlet pipe element, such that -- a rotation of the first and second coupler (31, 32) around the longitudinal axis (A 1) and -- at least partially an elastic deformation of the inlet and outlet pipe element (11, 12), said elastic deformation being essentially torsional - an inherent, inlet-side natural torsional mode of the first coupler and inlet pipe element has a natural frequency f 1 approximately equal to the excitation frequency f exc, and - an inherent, outlet-side natural torsional mode of the second coupler and outlet pipe element has a natural frequency f 2 that is essentially equal to the natural frequency f 1.