Features: 1Hard Plastic Material: Badminton racket tension calibrator is made of high quality metal hard plasticl, reliable performance, sturdy, durable and long service life. 2Easily Know Pressure Value: The special badminton racket tension calibrator can easily know the pressure value of the racket string and decide whether to replace the racket with a new string. 3Understand Racket Pressure Value: With the racket pressure measuring device, you can roughly understand the racket pressure value, compare different time spans, know how many pounds a worn racket loses in a day. 4Understand Racket Pressure Value: You can roughly understand know when to cut the ball line and replay it, and know what line of the ball is. The pounds fall fast, know what threading method the pounds fall slowly. 5Small and Portable: Small size, light weight, easy to carry around with you, 0?42 pounds range, clear reading, simple operation. Item Type: Badminton Racket Pressure Measuring Device Material: Hard Plastic Color: Black Weight: Approx. 91g / 3.2oz Package Included: 1 x&nbspBadminton&nbspRacket&nbspTension&nbspCalibrator