an electronic device to record which particular television channel is tuned to by a household; marketing research firms use audimeters attached to a sample of TV sets to measure national exposure to TV advertisements; commonly referred to as a "peoplemeter" or "black box". See Advertising Effectiveness.
a mechanical instrument or device for monitoring television usage and program choice (for ratings surveys, etc); colloquially called a people-meter or black box. See Single Source Data.
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