Those meters are all over the place. As the article mentioned, the majority of them only count the number of characters in each class, so they're pretty terrible at actually telling you how hard your password is to crack. Some of them are set to an absurdly high level too. The default Ubuntu meter for instance requires something like 16 characters before it will even consider your password good. I saw one where it wouldn't take your password unless it was at least 14 characters long, had all classes of characters in it (upper, lower, number, symbol), no more than two of the same class together, and "no patterns". At that point you just kind of have to accept that I'm going to stuff it in a password manager even though your site expressly forbids me recording my password elsewhere.