This app was a class project for a GEOL 470 Hydrogeology to measure the surface water velocity.
Check website for details
To measure distance or velocity between point A and B:
0. Make sure device is at a still and stable point in 3D space
1. Input height at which device is used in cm
2. Aim center cross at point A and press "start"
3. Make sure device is still and trail the center cross to B and press "stop"
4. Will output distance (cm), time (s), verlocity (cm/s). Repeat for accuracy