An extended yet free application for iOS 4 to measure acceleration accurately. It allows you to measure and organize those measurements in an awesome way => the way you expect it to work.
The first thing you should do, is calibrate your sensor so you get the most accurate results possible.
The best thing of all, it exports to Excel, so you can use your data directly on your computer. It records at a rate of 40 times a second ( 40hz ). The app is blazingly fast at saving and loading the data from storage.