Abstract: A tool, such as the torque wrench shown, has a fixed tube 2 and rotatable coaxial handle 9 which serves to move nut 5 longitudinally by means of screw 6, thus adjusting the compression of spring 4. The torque value is indicated by a scale 14 rotatable in housing 11 and viewable through window 13 which includes a cursor. The scale 14 is an extension of the dynamic spline 16 fixed to the tube 2 and wave generator comprising two flats 18, on the end 10 of handle 9, which press the splines into engagement at discrete locations. For every revolution of handle 9 the scale on member 14 will be moved a distance corresponding to one tooth pitch where the difference in the number of teeth 16 and 15 is one.