Instruct: Classify an Amazon review as either positive or negative.
Query: Cumbersome Use, Questionable Accuracy

This ball has to be gripped very firmly to start a reading; considerably tighter than one would normally clutch when throwing catch or pitching especially. This forces the user to modify technique significantly just to get a relatively accurate number.When a grip is released, the clock starts and the reading begins and stops when the ball is no longer moving. The ball is basically just a stopwatch that calculates feet per second and converts to MPH.In our testing, multiple throws made with the same effort at various distances measured up to 35MPH difference, depending on release point and pressure.Assuming you modify your release technique and mechanics, you should be able to get a generally (~20-30MPH accurate) correct reading by averaging several throws.If you want to measure pitching speed accurately, don't waste your money and buy a radar gun instead. If you want a party gimmick, these balls (sold under many brandnames) are a good buy.