John Harmon wrote:
Ooooops.
A search does find a variety of methods to check camber at home:
https://www.google.com/search?q=check+camber+at+home
where some of those articles used mobile phone apps

I had forgotten to link to a descriptive photo of the desired task:
http://i.cubeupload.com/6CPUl7.jpg

I'm sure there are gotchas (e.g., is the garage floor really flat?), but it
seems doable to measure camber at home if we can answer the main obvious
questions which are (I think):

Q: What accuracy is *needed* to measure camber at home?

..01 degree or better.

Q: What accuracy can be *attained* with a typical mobile device?

?????????? don't use one myself

Q: Is the repeatability sufficient in a typical home measurement setup?
Q: How do we compensate for typical errors (e.g., ride height, flat floor)?

Same way you do with the machines, Measure the floor and level the
machine prior to use. Using an app you could check the floor span where
you plan to do the work and zero it out.


What other gotchas will we need to look at to successfully measure wheel
camber using a mobile device in a typical garage setup?

How to attach the device to the wheel/hub.

--
Steve W.