Monitoring system for torsional vibration. The Geislinger Monitoring is an instrument designed to continuously monitor torsional vibration amplitudes. The system gives an alarm signal when safety limits are reached or exceeded. From measurements taken on one or two torsionally vibrating elements, for instance on a coupling or damper, the values of the static and dynamic twist between the elements and the vibratory angle of the elements are calculated. If an operating limit is exceeded, an alarm is activated. The calculated torsional vibration values are shown on the LCD display as figures and graphically in a bar graph or as FFT analysed values.