6.6.3 A reference torque device is required to calibrate the torque measurement system. A torque standard may be used to
calibrate the torque measuring system at the selected angular displacement by clamping a steel torsion rod to the oscillating
and the torque measuring dies of the torsion shear rheometer (see Fig. 2). The reference values for angular displacement and corresponding torque shall be established by the manufacturer for each torque standard.