SL-SF05 Temple Torque Tester Spectacle Frame Spring Hinge Durability Test Machine PLC Touch Screen Product Overview The SL-SF05 Temple Torque Tester determines whether spectacle spring hinges have sufficient durability to withstand opening and closing angles under specific torsion forces, while evaluating the durability of repeated opening and closing cycles to detect spring life changes in spring hinges. Key Features High Precision: PLC control with touch screen count