Markwort Speed Sensor White Cover 9-Inch Baseball

Measure distance between pitcher and catcher with included measuring string and choose one of 8 predetermined distances (20', 30', 40', 46', 50', 60.5', 70' and 80')or for SPEED-KM (6m, 9m, 12m, 14m, 16m, 18.44m, 21m and 24m). 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.