1) Function: mainly used for torsion test of metal wires Ф1.0～Ф10.0mm . The instrument is used to determine the ability of metal wires to withstand plastic deformation in unidirectional or bidirectional torsion and to show the surface and internal defects of wire rods. It provides reliable measuring means for winding wire manufacturers and users.

2) The main technical parameters:

（1）A. Test range of wire sizes (mm): φ1 to φ10；

（2）Coaxiality of two chucks (mm) <φ0.4；

（3）The degree of parallelism within the full length  of the moving guide (mm) <0.2；

（4） Maximum distance of two chucks (mm) >550；

（5） Rotation speed (r/ min): 30, 60, 90, 120 ±10%；

（6） Jaw hardness (HRC): 55-65；

（7）Allowable deviation of weight: ±0.01%；

（8）tester working noise (dB) <70.