reference gauge

15 LETTERS · STARTS WITH R

reference gauge is a valid 15-letter word worth 21 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1E1F4E1R1E1N1C3E1G2A1U1G2E1

1 + 1 + 4 + 1 + 1 + 1 + 1 + 3 + 1 + 0 + 2 + 1 + 1 + 2 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does reference gauge mean?