Steel strand Stress Relaxation Tester, PC Steel bars Stress Relaxation Tester, 1000 hours Steel strand Relaxation Test, Steel bars Stress Relaxation Tester, 1000 hours Steel wires and bars Relaxation Test, 1000 hours Metallic materials Tensile stress Relaxation Test, ASTM E328-2013，ASTM A416，ASTM A882, AS/NZS 4672.2, JIS G3536, JIS Z2276-2012, JIS G3137, ISO 15630, BS5896-2012, ISO 6934, ISO 14655, EN 10391,  AS/NZS 4672.1