A screen is measured diagonally - from the bottom left to the top right. In the USA, it's measured by a number of inches. A 24-inch screen is 24 inches.
There are some cases when a 24-inch screen might not be exactly 24-inches but somewhat near that. In those cases, one would add the word class. A 24-inch class screen might be 23.5 inches or 24.5 inches. Adding Class to the size delivers a broader range that may even include 24 inches.
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