Crossword Genius

You can view Venus with it (5,3)

Ross

I believe the answer is:

naked eye

(Other definitions for naked eye that I've seen before include "(View) unaided by any optical instrument" , "It doesn't need a visual aid to see" , "With which to observe" , "Unassisted sight" , "Observer" .)

I've seen this clue in The Wall Street Journal.
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