Difficulties 27, 28 and 29 of Nanjing explain about nature of appearance of eight extraordinary meridians, its diagnosis and symptoms.
Acupuncture pulse diagnosis shows development of disease in common and connected to them extraordinary meridians.
Here is another difference from herbal pulse diagnosis. Acupuncture pulse diagnosis indicates exact pares of affected extraordinary meridians and shows how these meridians are affected in pares.
Pulse shows directly condition of common meridian, knowing its condition we may diagnose indirectly condition of connected extraordinary meridian.