They are used for tension-compression, torsion, fatigue, sorting and strength test of various kinds of springs, I.e. helix spring, worm spring, papilionaceous spring etc. TNS-L Series: 50-5000Nm 7 kinds of specifications, digital display torque and torsion angle, vertical construction and easy to operate. TNS-S Series: 500-100000Nm 8 kinds of specifications, digital display torque and torsion angle & printing test report. TNS Series: 500-5000Nm 4 kinds of specification, digital display torque and torsion angle, horizontal construction