i'm pretty sure i seen an app that would measure up to a metre using the camera, (can't vouch for the accuracy) also pretty sure it was called metre, but i cant find it in the repos so i may have dreamed it. :S
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sarcasm may be the lowest form of wit, but its the only wit i have.
its a sad day when i can't slip at least one hitchhiker reference in somewhere.
I would like to use my n900 to measure cm/inch.
If nobody did I will have to use imagemagick to construct such a picture.