The GESTER GT-C39A Zipper Fatigue Tester is the industry-standard equipment for determining the reciprocation resistance and long-term durability of slide fasteners. By driving the zipper through continuous back-and-forth cycles under lateral and longitudinal tension, it evaluates physical wear, fluffing, joint displacement, and connector failure. Equipped with an LCD counter and automated machine stop, the GT-C39A provides a highly accurate, cost-effective testing baseline compliant with global standards like BS 3084, EN 16732, ASTM D2061 and SATRA TM50.