Crossword puzzle clue "cards tools used in esp testing"

Here are the possible solutions for cards tools used in esp testing clue

Answer
Clue
Relevancy
zener
Clue
___ cards (tools used in ESP testing)
___ cards (items used in ESP tests)
__ cards, used in ESP experiments
___ cards (ESP testers)
ESP test cards eponym
echo
Clue
"TESTING, TESTing, testing," e.g.
Definition
a reflected sound
zenercards
Clue
Tools for ESP researchers (whose symbols are found at the ends of the answers to the five asterisked clues)
roadie
Clue
"Testing, testing, one, two" tech

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