Measure the velocity of moving object with your phone.
Speed Gun is a tool in extended set of the Smart Tools collection (speed).
This app measures the speed of a moving object by touch like a velocimeter.
Usage is easy: To measure the speed, input the closest distance to the target, and touch the screen following target.
There are too many android devices in the world. If yours is inaccurate, you can calibrate it by yourself.
* Do you want more tools?
Get [Smart Distance Pro]