9 Degrees Freedom

9 Degrees Freedom offers a tennis performance sensor that provides real-time stroke & video analysis to give deep insights into your speed, swing, ball spin and more. It is also the lightest tennis sensor in the market at just 8 grams, and attaches directly to the string of any tennis racquet.

Unlike other tennis sensors, Qlipp is attached to the strings instead of the base of the racquet. Having the gadget on strings provides more accurate data on the racket head speed, the spin imparted by the strings on the ball and also the contact point on the string bed relative to the sweet spot.