We all might have bought Television sets and computer monitors. But many people still do not know how to identify the screen size by looking in to the monitor.
So here is the simple way. Just measure the diagonal width of the screen and this gives the screen size.
It is also to be noted that, for the same screen size, a LCD monitor will give a larger display.
Computer monitors come in 15 inches, 17 inches, 19 inches and so on.