Recently, however, the Trackman Tennis Radar (Trackman. Inc), a device that can easily measure the spin rate of a hit ball in tennis, has been developed. Murakami et al. (2016) verified the accuracy of the speed and spin rate of a trackman. They reported that the measurement accuracy was comparable to that of a previously used high-speed camera.
https://journals.lww.com/mjmh/fulltext/2021/10010/the_differences_in_the_ball_speed...