Abstract: A pair of velocity sensing devices are disposed on opposite sides of the proposed path of travel of a ball with the electromagnetic energy beams from the devices directed at acute angles to the proposed path of travel. Velocity signals generated by the two devices are averaged and converted to visible messages concerning the speed of the ball and its likely distance of travel has its flight not been interrupted. Velocity signals are also compared to generate a visible message concerning the deviation of the actual path of travel of the ball from the proposed path of travel.