Quote Originally Posted by Kurald Galain View Post
While that sounds not unreasonable, you have to admit that RAW doesn't actually say so, and that the other interpretation (that skills which don't use tools also don't have masterwork tools) is equally valid.

As a related issue: whenever the MW tool for anything is asserted to be any kind of reference book or any kind of laboratory equipment, using the skill would logically take several rounds. How many seconds does it take you to find something in a paper encyclopedia?
Hence why I always suggest a Pokedex for the Knowledge tools.