We are developing a web based measurement app which we want to keep very simple.
It will be used mainly to measure distances and angles and measurement data will be able to be emailed along with the image of the measured object.
We will use A3 and A4 sheets for scaling.
To give you some ideas you might like to look at Tracker which is just one of a number of really good, free, phone based measurement programs.
We are trying to keep ours simple and easy to use so judge for yourself, try out what we have now at www.phonelabs.net/m
Feedback will be appreciated.