Abstract: Measurement sensor for length or distance changes, particularly for non-contacting measurement of torques of rotating shafts. In known measurement sensors, the length or distance change (.DELTA.x) is amplified by a mechanical lever system and is then converted into an electrical quantity. In the novel measurement sensor of the present invention, the length or distance change (.DELTA.x) to be measured is transmitted to a displacer in order to enhance the precision. A displaced liquid, particularly mercury, is introduced into a capillary and the length of a liquid column in the capillary is converted into an electrical quantity, preferably as a change of a resistor. The new measurement sensor is particularly suitable for torque measurement.