This is a speed gun app for those who want to know the ball speed. The distance and time (from start to stop) are used to measure the speed of the ball. ● Measurement way Start measurement when the ball is thrown, and stop measurement when the ball is caught. The time from the start to the stop is used to calculate the ball speed. There are two ways to stop the measurement. One is to tap the button to start and tap it again to stop. The other is to start when the button is tapped and stop whe