Markwort Speed Sensor Baseball, Press start, throw the ball, and the LCD indicator displays pitch speed in MPH upon impact. Official size and weight of a regulation baseball, but used as a training aid for any age or skill level. Measure distance between pitcher and catcher with included measuring string. Speed Sensor GripSense technology begins to record the speed automatically the moment the ball is released. For pitching throwing training only, not to be hit with a bat or on hard surfaces. Measures speeds up to 120 MPH.