I have learned a lot by not only reading the article but also the comments. I too have a version (or two or three) of the original 6 listed, and quite a few of the added suggestions, so I'm feeling pretty good about myself. And as long as I still have some vehicles (and other machinery) that I can use them on, I'm happy. But I have some stuff that these tools won't tell me as much as a computer code-reading devise will. I'm thinking that eventually, sensors and chips will rule the world.
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