Under $40 and you can see
http://www.harborfreight.com/clamping-dial-indicator-93051.html .
FWIW when I worked at the front end shop we turned every rotor & drum
that came out of the box before it went on the vehicle.

Rob
vwrobb@gmail.com

At  5/8/2014 09:45 AM, Neil N wrote:
>This is the kind of idea I was originally curious of.
>Sounds like a dial gauge would be a useful tool.
>
>
>On 5/7/14, SDF ( aka ;jim lahey' - Scott ) <scottdaniel@turbovans.com> wrote:
>
> > I just stick my dial gauge on a jackstand next to the mounted up rotor
> > n' spin the rotor slowly.