Device for measuring at least one physical parameter relating to a propelled game ball

(57) It is equipment (1) for measuring the hit ball speed of the athletic ball hit by the summary hit ball implement, especially the tennis racket (2), and this equipment is directly formed in a racket. At least one measurement sensor which outputs the signal of the oscillating intensity which this equipment is attached to the string (4) of a racket (2), and is generated by the ball, The signal was analyzed and it has the means for processing the above-mentioned signal using the microprocessor which determines the measured value of the speed of a ball, and the means (6) for displaying the above-mentioned value. A processing means contains the proofreading unit for rectifying measured value automatically according to the feature of a racket and a ball at least so that a result may be made which has high reliability very exact. The above-mentioned measuring device is small, cheap, and it is attached to the small housing (3) attached to the racket (2) so that a player can read the value of direct speed. This equipment is effective from the arbitrary sports which use projection and a hit ball element, i. E. , a game, and tennis.