This comment was posted on the G-Meter page yesterday:

Fine, as far as it goes... Samsung Galaxy Ace (CM10 ROM) Does what it says but the graph is limited to +/- 0.25G - I don't know what old banger the developer drives but you can exceed that just pushing the car...! Needs adjustable scale and log function before it's useful.

The old banger is indeed pretty old! But good point nonetheless. Expect the change described above in the next version!