It is a useful tool for sports commentary and watching.
It consists of three parts: stopwatch, speedometer, distance meter.

[Speedometer]
First, set the distance of the interval to measure speed.
For example, if it is baseball, choose 60.5 ft between PCs.
You can measure the pitching speed by pressing the Start / Stop button.

[Distance Difference Meter] You can measure the distance between moving objects AB.
First, set the speed to measure.
For example, choose a marathon.
Press Start / Stop button to measure distance difference between runners AB.