Crossword Genius

Standard of comparison (9)

Ross

I believe the answer is:

yardstick

(Other definitions for yardstick that I've seen before include "Standard of measurement" , "Benchmark" , "Standard base for comparison" , "Criterion - means of measuring" , "Three-foot rod as standard of comparison" .)

I've seen this clue in The Independent, the New York Times, the L.A. Times Daily, the Newsday.com and The Times.
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