Ujjdwiurgh Badminton Racket String Meter String Machine Tools, AC-SM200 Tennis Stringer, Stringing Tools, Tension Calibrator,Black

2. A must have for proper stringing machine maintenance. 1. Feature:Keep your reference tension in check with the tension calibrator stringer tools 3. A racket that has just been put on or used for a period of time, usually the midpoint value of value measured by the pressure gauge is too small, and the pressure value around to be more pounds, compared to the horizontal line, vertical 's beat value to be more pounds.