For maximum torsion testing versatility and capability, Tinius Olsen offers a full range of torsion testing machines in capacities from 1,000 to 30,000 Nm. These uniquely superior torsion testers provide loading and weighing capabilities in both directions of rotation. This feature makes it possible to conveniently determine not only the ultimate torque load of a specimen, but how that specimen behaves under conditions of continuous or intermittent torque loading in both directions. Essentially, each torsion tester comprises a variable speed drive loading system and a digital control and indicating system in a fixed unit. The weighing head with its strain gage torque sensor is mounted on a moveable unit which can positioned on the rails to accomodate specimens of varying lengths.