All monitors come with a factory calibration to help ensure a certain level of accuracy in some modes and for a variety of common uses. If the user needs more control over gamma curves, white point, color space mapping, etc., then a separate calibration device is needed that can profile the monitor and create a common ICC profile. This is used for further correction and improved accuracy in color-sensitive applications. The next level are monitors that support hardware calibration. These monitors allow you to calibrate the screen itself, access internal look-up tables (LUTs), and make corrections and changes to the monitor itself. There's no need to rely on or worry about ICC profiles, application support, or anything else. Settings are saved at the monitor level. This is a more flexible calibration option, and is almost exclusively for professional monitors. It's rare to find this support on consumer or gaming displays. Two of the models mentioned in this roundup (P...