TV Measurement is a term used to describe the way in which television programs are measured and evaluated. It includes three main components: DIAGONAL, Hor, and RATINGS. DIAGONAL is a measurement of the size of a television screen, usually measured in inches from one corner to the opposite corner. Hor is a measurement of the width of a television screen, usually measured in inches. RATINGS are a measure of how many people are watching a particular television program, usually expressed as a percentage of the total number of viewers.