To be fair, the Part P Doctor is a pretty good book! Basic stuff to a seasoned spark but for the newer guy invaluable! Loads of myth busting, loads of helpful fault finding tips, good clear testing advice and instruction, full of pictures and diagrams!
I got this book a year ago 'free' with another purchase I made, I don't need it, so I'd rather sell it to someone who does.
As for my GN3, I have two copies, I bought one for my apprentice as a present but he already went and got one for Christmas from someone else before I could give it to him.