That installs on the COAX incoming to the T.V.
AND details the I.Q. of the Talking Head (OR "Talent") appearing on camera at the time.
(A Second sub meter would Judge Intelligence based on Vocabulary)

Would these devices be any kind of (accurate/empirical) Judgment of the general populace's level of "Smarts"?

(Hey,We watch these Muffin Heads,What does that say about US ?)

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'84 300SD sold
124.128