With ballTester you can determine if a basketball or football is correctly pumped or if a tennis ball still is OK.
Drop the ball on a hard floor and let it bounce a couple of times. The rebound height is given in cm or inch and the "light" will show wether the ball follows international rules (FIFA, FIBA, NCAA, ITF) for the ball type.
ballTester measures the bounce time with 1 ms accuracy and takes non linearities like air resistance and bounce characteristics into account.
ballTester is free during an introductory period.