The patented, optoelectronic torque measuring shaft DATAFLEX provides the user with accurate measuring data in combination with an excellent temporal resolution at an unbeatable price. DATAFLEX® visualizes dangerous torque peaks which often cannot be calculated and which can only be determined by field tests. Recently included in the programme has been DATAFLEX 16 for small torques. As an extraordinary feature it provides for high measuring accuracy and has a high-resolution speed sensor the signals of which are available both as rectangular pulses and direct voltage. Ideal is the combination of DATAFLEX with a steel lamina coupling of the series RADEX-N or RADEX-NC.