Abstract: A sports swing-impact-speed indicator (1) has a solid state accelerometer (20) which measures impact speed of swing of a sports swing-impact implement during an event-time window of an event-window timer (21) following a select swing-acceleration time. The accelerometer can be a miniature solid state unit with a ratio-metric voltage signal that is directly proportional to centripetal energy imparted by travel of the implement, such as a baseball bat (2), during the event-time window. A digital readout (10) has preferably Liquid Crystal Display that can be seen in bright-light-to-dusk visibility conditions. Singular readout and selectively automated control provide simplicity of use. The unit can be attached to a desired implement such as a baseball bat with a slip-on pliable sleeve (3) or other quick-fit device. Minuteness of electronic components permits use of a small stored-energy (18) and/or solar-powered battery (19) for power.