... , armrest of sofa, it can also test single,double and three seat. Sofa Durability Tester is designed to evaluate the mechanical fatigue ... use, as well as acceptable mis-use.Force apply for seat fatigue : 750 NForce apply for back fatigue: 400 NTest cycles ... pressure of back: 80kg.2) Can test a single seat, double seat and three seat sofa, each group can adjust independently.3) Power: 220V ...