A measurement device for magnetic resonance applications includes, in a measurement case: a first sensor for measuring radiofrequency magnetic fields; a second sensor for measuring magnetic field gradients; and a third sensor for measuring the radiofrequency electric field; and a stage for converting the electric signals delivered by the different measurement sensors into light signals. The device also in a controller for controlling and processing the signals, connected to the stage for conditioning the measurement case via a beam for transmitting light signals. The controller includes a stage for converting light signals into electric signals delivered by the sensors.