The Speed Gun application plays back videos that have been taken or stored on the device, and measures the speed of the ball with a single touch.

Pitch speeds can be measured by touching the screen as the pitcher releases the ball and releasing the finger from the screen as the catcher catches the ball.
Since the video keeps looping, you can measure accuracy by repeatedly measuring a short video of only one pitch and obtaining an average value.

The measurement distance can be selected from the following three options.
60 feet 6 inches (Adult)
50 feet (youth)
46 feet (Ages 8 & Under)