In general, lower numbers are better, producing finer detail and crisper images. Avoid models with dot pitch any higher than 0.28 mm, or text and images may look grainy. Many have controls to adjust the image to fill the screen, to shift it horizontally or vertically, and to correct distortions. These are just a few inches deep and weigh 15 pounds or less. Unlike CRTs, a 15-inch LCD has a viewable image of 15 inches.
Flat panels display very sharp images with little glare, no flicker, and low power consumption.
Once you've chosen a monitor, think about where to place it. Experts suggest you sit 18 to 30 inches away, with the top line of text just below eye level. Good lighting and the placement of the keyboard and mouse are also critical. A. Not really. Screen savers can be fun, can keep passersby from seeing what's on your screen, and shouldn't cause harm, in any event.