And to all of THAT you can add the Janka scale of hardness for determining the hardness of various species. However, even that scale is an average and doesn't take into consideration all the variables Mother Nature can throw at you in any given species. I completely agree with a qbilder up there who listens to the piece of wood. Believe it or not to the trained ear that information tells the whole story. At least to me it does......
I've been a pro in the violin trade for over 30 years. I really respect a guy like Eric who actually cares about going for the tone he is looking for in a cue.