The John Scale

The scale from 1-10 for rating a girl on which personality is the judging criteria.

Such features include whether the girl is nice/fun/funny/sporty etc.
The ratings on the John Scale will depend on each individual's view of their ideal girl.

Person 1:- "Mate, she's only a 5 out of 10!"

Person 2:- "Yeah but she's a solid 9 on the John Scale!"