We bought a little camera to replace one that got stolen just for scaling customers vehicles.
I didn't want to buy anything as expensive as our previous camera as it was upsetting loosing £1,000 worth of camera.
Now cameras have come down in price and the resolution has shot up and it makes some of these small ones with over 12MP seem almost throw away priced.
But be aware some of them like ours have a very small lense and although the pictures are crystal clear they temd to be very distorted and when looking closely the image is almost as if a fish eye filter has been used such as this :-
http://www.uteroemer.de/Fish eye lens2.JPG
We have had no luck in scaling up some photos as straight lines are curved and the image is squashed.
I presume the bigger the lense the better and less distorted the image is!
SC