Crossword Genius

Pool water tester (3)

Ross

I believe the answer is:

toe

'pool water tester' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for toe that I've seen before include "Conform-...the line" , "A foot division" , "Lower end or tip" , "Front of shoe" , "Feature of footwear" .)

I've seen this clue in The Washington Post Sunday, the Universal and The Wall Street Journal.
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