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It can give you a basic idea of whats going on beyond what you can actually see. Cross match sounding with external evidence of bulges, splits, cracks, bark texture, reaction wood, distribution of mosses and lichens... Try it on some trees you know have to come down, sound them first, form an...

Yes, I know of one guy who can pretty much do that. However he will back it up with a drill or Picus or a pull test or monitoring. In the end, its a tool in the toolbox, and the target and potential for damage, injury or death also plays a big part.

We routinely use a 'Thor' nylon hammer to sound trees. Its a part of every biomechanics, or tree assessment course I have done. Some people are really good at it, those who are very knowledgable about decay fungi and the fungi's methods of decaying a tree and which parts they concentrate in...