Tension Calibrator black Pro's Pro Tension Calibrator lets you easily check the tension accuracy of a stringing machine. This calibrator offers a precise spring scale (in both kilograms and pounds) and can be used on all stringing machines, regardless of stringing machine brand The Pro's Pro calibrator can be used whether you are stringing for tennis, squash, badminton or racquetball. This spring scale works best using a polyester tennis string The scale runs from 0 to 80lb, covering five centimetres in length.
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