ITEM NAME:Heavy Duty Tennis String Tension Calibrator Racket Stringing Tool Description: Badminton String Tension Tester tests the tension loss in your racquets, allowing you to compare actual tension differences between strung racquets. 0-42lbs Know when it is time to restring Easy to operate Materials: Plastic + Stainless steel Size: Whole length -9.8cm, Diameter - 7.3cm Package Includes: 1 Piece Badminton String Tension Tester Checker SKU: DMO0018234454022503.Badminton String Tension Tester tests the tension loss in your racquets, allowing you to compare actual tension differences between strung racquets. 1 Piece Badminton String Tension Tester Checker. Materials: Plastic + Stainless steel.