Crossword puzzle clue "what zener cards were used to test for"

Here are the possible solutions for what zener cards were used to test for clue

Answer
Clue
Relevancy
esp
Clue
What Zener cards were used to test for
Zener cards test for it
Zener cards test it
What Zener cards test
What Zener cards test for (abbr.)
"Sixth sense" that Zener cards supposedly test: Abbr.
It's tested with Zener cards
esptest
Clue
Zener cards are used in it

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