This rule, also known as the Picture Tube Rule, became effective in 1967. The rule sets forth appropriate methods for measuring television screens when that measure is included in any advertisement or promotional material for the television set. If the measurement of the screen size is based on a measurement other than the horizontal dimension of the actual viewable picture area, the method of measurement must be clearly and conspicuously disclosed in close proximity to the size designation.

As part of the systematic review of its rules and guides, the Commission plans to request comments in 2017 on, among other things, the economic impact of and the continuing need for this rule; possible conflicts between the Rule and State, local, and other Federal laws; and the effect on the Rule of any technological, economic, or other industry changes.