The Newseum has created a Fairness Meter. The poster is in .pdf format; is the text of the poster (from NewseumED):
Unfortunately, news doesn't come with labels of "FAIR" or "BIASED." But you can develop your own "fairness meter" by using three key factors to measure how straight or slanted a story is.
Does the story simply present the facts or lead you to make judgments about them?
Example of Leading Language: The superintendent's pet project failed spectacularly less than three months after she shoved it through the approval process.
Does the story provide the big picture or just a slice of what's going on?
Example of added context: Prior to accepting the role as city transportation manager, Smith received a PhD in urban planning and ran a private limo company.
Does the story help you understand multiple perspectives, or only one?
Example of a counterpoint: While supporters say the new tax bill will increase education funding, critics point out that middle-class families will bear most of the burden.