TekGems has a very good gadget (infact a ball) available for all the Baseball Pitchers. It’s the Speed Sensing Digital Laser Baseball which can show the speed of the ball at which is delivered right on the ball.
Its size and weight is the same as in the real game. It has a hand sensing technology and reads accurately from 20 to 120 MPH. As soon as the ball is released from the hand, the speed is calculated and is displayed when it is caught. It is meant for practice purposes so obviously no hitting with the bat. It is available for $23.
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[Via Coolest Gadgets]