Measurement application ideas

[Snoman002]

Are the speaker and microphone on the TP accurate enough to use them for a sonic measuring tool/range finder? You know, send out a sound pulse, measure the time it takes for an echo to return and calculate the distance from the phone to the object.

Or, could the g-sensor be used for a similar thing, start the app, slide the phone along the object, stop sliding, and it gives you the measurement.

I looked some but I couldnt find anything along these lines.