Features: Understanding Racket Pressure Value: With the racket pressure measuring device, you can roughly understand the racket pressure value, compare different time intervals, know how many pounds a worn racket loses in a day.Hard plastic material: Badminton racket tension calibrator is made of premium hard plastic, reliable performance, sturdy, durable and long service life.Understand racket pressure value: You can roughly understand when to line the ball and it, and know which line of the ball is. The pounds fall fast, know which gang method the kilos fall slowly. Portable and easy operation: It is easy to carry, 0-33 pounds range, clear reading, easy operation. Easily learn the pressure value: The special tension calibrator for the badminton racket can easily know the pressure value of the racket string and decide whether the racket should be replaced with a new string.Specifications: Material: plastic Black color Size: 8 cmFunction: Impact pressure measurement Applicable scene: badminton, tennis Package includes: 1 x Tension meter Note: Please allow 0-1cm error due to manual measurement. Please make sure you do not mind before bidding.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!