If you wonder how many g’s that roller coaster reaches or how fast your car/bike accelerates then Grav-O-Meter is for you.Shows acceleration in realtime as well your highest ever. See how fast you can spin. But be careful!Feel the g-force!(NB this is not the Punch-O-Meter, all I shall say is that Grav-O-Meter is the original and most full featured tool!)