Monitors can range from 14 inches up. A larger monitor is advantageous but adds to cost and can be quite heavy. It is important to know that the place where you will be using the monitor has enough space in all dimensions to hold the monitor. Color monitors are the standard today. You should be sure the monitor you select will work with the computer you purchase.
Important considerations are dot-pitch, refresh rate, and resolution.
We do not recommend monitors with a dot pitch larger than .28 mm. It defines how fast the screen is re-drawn by the computer. A higher refresh rate means less flicker on the screen. A refresh rate of 75 Hz is usually acceptable for 19 inch and smaller monitors. 85 Hz is better.