I have made a logo in Illustrator and now I want to deliver it to our client. But I also want to send him a little logo guide and for that, I want to specify the tracking of the letters. A "-25" is in the input field of tracking. I found out that the tracking unit is the Quad (Geviert in Germany, I hope that's equal).
What should I write in the Logo guide so that every designer will know how to adjust the tracking if he'll reconstruct the logo? Does it depend on the font size?
How do you specify it universally?