Aperture grille type of CRT is made by Mitsubishi and Sony under names of DiamondTron and Trinitron. It is a wire frame strung with metal strings and it offers better brightness and color saturation, especially important for graphics artists. Some users may be annoyed by a hair-thin wires stretched across the screen that are required in these types of monitors. Other innovations like Croma Clear and SuperClear also offer enhanced color fidelity and brightness. Monitor's size is measured diagonally.
Manufactures publish viewable screen size, which is slightly smaller than the CRT size.
Of course, more desk space is required for larger monitors. Monitor's maximum resolution is important for larger monitors. Refresh rates refer to how many times the screen is repainted in a second. The higher the rate, the more stable the image appears and there is less eyestrain due to flickering. 75 Hz is a minimum for a flicker-free rate.