Pitbull
is one Smokin' Farker
He says it is feel and SMELL of the meat...Not sure I will ever get good enough to know by smell.
I worked with an old pitmaster back in the 60's that just used feel, smell and looks. He never missed as far as I know and I still think he made the best Q that I've ever had the honor to eat. I'm still not good enough to do that either. Will probably never be.