Water-testing digit

This time we are looking on the crossword clue for: Water-testing digit.
it’s A 19 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: TOE.

Last seen on: –Eugene Sheffer – King Feature Syndicate Crossword – Mar 5 2022
Universal Crossword – Jun 26 2019
The Washington Post Crossword – Jan 14 2019
LA Times Crossword 14 Jan 19, Monday