The product produced is a digital-based instrument of ball placement accuracy for table tennis by using an electrical circuit automatically arranged when the ball touches the instrument, producing an output data in the form of an automatic count in accordance with the number of balls that touch the tool. Results of output data will be displayed on the LCD display, so that users can immediately record the data when the ball touches the accuracy instrument. | Designing a digital based instrument of forehand service ball placement accuracy for table tennis
