Curious as to how fast you can throw a baseball? The standard way to find that out would be by acquiring a baseball and a radar gun. But why buy two items when you can buy one that combines them both?
The SmartBall is a baseball with a built-in radar gun that shows you exactly how fast you throw it. Sure, it probably has a different weight than a normal ball and hitting it with a bat is a quick way to break your expensive new ball, but if you want to gauge your pitches this looks like as good a way as any.