Designed for tennis stringing machine technicians, stringers, and tennis enthusiasts, the GAMMA Sports Stringing Machine Tension Calibrator tool is a must-have for any badminton or tennis stringing kit. This tension calibrator is universally compatible with all stringing machines, making it a versatile tool for your tennis or badminton string machine. The main purpose of our tension calibrator tennis is to check the accuracy of your stringing machine. Its designed to test up to 90 pounds of tension, providing you with precise and accurate readings every time you use your tennis string machine or badminton training machine. This string tension calibrator is also equipped with a string on both ends, which allows you to test the tension in the most practical way. This tennis string calibrator is a convenient and efficient tool for those who want to ensure their tennis racquet stringing machine or tennis racket restringing machine is always on point. It can also be used as a tennis stringer tension tester, a racquet string tension tester, or a badminton string tension meter. Experience the quality and precision of GAMMA Sports products with our stringing machine tension calibrator.