Vibronic-type transducer for a medium flowing through a pipe, said transducer comprising: - at least one measuring tube, which vibrates at least temporarily, communicating with the pipe particularly by means of an inlet pipe segment which enters into the inlet side and via an outlet pipe segment which enters into the outlet side, said measuring tube being designed to conduct medium to be measured, - a counter-vibration mechanism, which is fixed on the measuring tube on the inlet side forming a first coupling zone (11#) and which is fixed on the measuring tube on the outlet side forming a second coupling zone (12#), - at least a vibration exciter, particularly electrodynamic, designed to generate mechanical vibrations, particularly in a differential manner, at least of the measuring tube in relation to the counter-vibration mechanism, as well as - at least a first vibration sensor, particularly electrodynamic and/or located on the measuring tube on the inlet side, said vibration sensor being designed to capture, particularly in a differential manner, vibrations at least of the measuring tube in relation to the counter-vibration mechanism, -- wherein the at least one vibration sensor has a coil, particularly fixed on the counter-vibration mechanism, and a permanent magnet magnetically coupled with said coil, wherein said magnet is located inside a magnetic cup, which consists at least partially of a magnetically conductive material, and which is held itself on a cup base, particularly one that is secured on the measuring tube, and -- wherein a wall (51c") of the magnetic cup, particularly one that is essentially circular cylindrical and/or tubular, extends from the base of the cup, particularly essentially in the direction of the counter-vibration mechanism and has a slot (511c") which particularly extends at least in part in the direction of the vibrations of the measuring tube in relation to the counter-vibration mechanism. - at least one measuring tube, which vibrates at least temporarily, communicating with the pipe particularly by means of an inlet pipe segment which enters into the inlet side and via an outlet pipe segment which enters into the outlet side, said measuring tube being designed to conduct medium to be measured, - a counter-vibration mechanism, which is fixed on the measuring tube on the inlet side forming a first coupling zone (11#) and which is fixed on the measuring tube on the outlet side forming a second coupling zone (12#), - at least a vibration exciter, particularly electrodynamic, designed to generate mechanical vibrations, particularly in a differential manner, at least of the measuring tube in relation to the counter-vibration mechanism, as well as - at least a first vibration sensor, particularly electrodynamic and/or located on the measuring tube on the inlet side, said vibration sensor being designed to capture, particularly in a differential manner, vibrations at least of the measuring tube in relation to the counter-vibration mechanism, -- wherein the at least one vibration sensor has a coil, particularly fixed on the counter-vibration mechanism, and a permanent magnet magnetically coupled with said coil, wherein said magnet is located inside a magnetic cup, which consists at least partially of a magnetically conductive material, and which is held itself on a cup base, particularly one that is secured on the measuring tube, and -- wherein a wall (51c") of the magnetic cup, particularly one that is essentially circular cylindrical and/or tubular, extends from the base of the cup, particularly essentially in the direction of the counter-vibration mechanism and has a slot (511c") which particularly extends at least in part in the direction of the vibrations of the measuring tube in relation to the counter-vibration mechanism. -- wherein the at least one vibration sensor has a coil, particularly fixed on the counter-vibration mechanism, and a permanent magnet magnetically coupled with said coil, wherein said magnet is located inside a magnetic cup, which consists at least partially of a magnetically conductive material, and which is held itself on a cup base, particularly one that is secured on the measuring tube, and -- wherein a wall (51c") of the magnetic cup, particularly one that is essentially circular cylindrical and/or tubular, extends from the base of the cup, particularly essentially in the direction of the counter-vibration mechanism and has a slot (511c") which particularly extends at least in part in the direction of the vibrations of the measuring tube in relation to the counter-vibration mechanism.