Custom white balance - how to tell what it actually is

HI - 5D newb here.
I'm shooting in RAW and I want to confirm/determine what my actual custom white balance temperature is set to on my 5D MK III when I take a sample with my light disc and use it to customize white balance.
The thing is, I have photos I'm needing to take in a procession, moving from light source to light source, and auto wb isn't cutting it. What I want to do instead, is match the temperature on the light sources in two of the locations to the original light source, so the shots can be shot "live" with custom white balance that works all the way through.
But when I set it to custom, while it looks great in-camera, I'm not seeing anywhere in the camera that will tell me the actual WB temperature that was detected and compensated for.
Any suggestions?
Thank you
Bill

billium99 wrote:
Thanks Skirball - my problem is that I can never achieve the realistic color I seem to get very easily using custom white balance in-camera.
And yes, you can manually set the temperature, or you can take a photo with a light disc and tell the camera to use that image as the basis for white balance. This is also technically a custom WB setting. THAT's the value that I can't seem to get downstream, and my guessing at the right temperature in post processing has been a frustrating, futile effort.
Thanks
Bill
I'm assuming by light disc you mean a white card (or better, gray card)?
I thought (guessing here) that when scrolling through the histograms in camera that it will tell you the temperature you shot at.  But I don't think it tells the tint (magenta).  However, any good post processing software will do it for you.  You can simply copy the settings of the photo you like and it'll apply it to any others.  Or just look at the values of the temperture and tint. 
Although, as I reread your first post, I'm not sure that's what you're looking for.  If you're trying to balance what is "white" under different light sources then you don't want the same temp and tint settings.

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