tlvp actually said:

So don't measure in inches. If you have tools to measure camber in degrees,
you can surely repurpose them to measure toe-in in degrees also, no?

Let's think about what you just suggested.

While what you said sounds easy, which is that if you can measure camber in
degrees, why can't you measure toe in degrees, your truism ignores the
simple unalterable but very basic fact that the tool uses *gravity* to
measure angles.

That is, gravity-based tools work fine for measuring camber.
http://farm4.static.flickr.com/3027/...ffee13e89e.jpg

But how are you going to shift gravity by 90 degrees in order to measure
toe the same way?