I don’t think this statement communicated well (I almost reflexively downvoted) because “instruments” is a term that typically implies design and hence purpose.
It might be better to say that the purpose of psychometric instruments is simply to reveal truth, and truth doesn’t have a specific purpose (it’s just useful for lots of things you might want to accomplish).
Compare the statement “an inch has no purpose” to the statement “a ruler has no purpose”—the latter has the purpose of measuring the former, whereas length itself is just a property of an object in the universe.
I don’t think this statement communicated well (I almost reflexively downvoted) because “instruments” is a term that typically implies design and hence purpose.
It might be better to say that the purpose of psychometric instruments is simply to reveal truth, and truth doesn’t have a specific purpose (it’s just useful for lots of things you might want to accomplish).
Compare the statement “an inch has no purpose” to the statement “a ruler has no purpose”—the latter has the purpose of measuring the former, whereas length itself is just a property of an object in the universe.