The Datacolor Spyder4 Elite is a colour calibration device that can
be used to calibrate monitors, projectors, laptops, TVs, iPads and even
smartphones using an easy-to-follow step-by-step based process.
Like the X-Rite ColorMunki Display,
it works by by measuring a series of colours on a screen and creating a
"profile" that can be saved and replicated on other devices. However,
the two tools are different beasts in that the Spyder offers a much
wider range of calibration tests beyond basic colour correction, making
it a more serious option for photographers, video editors, web designers
and other professionals who need to calibrate beyond colour accuracy.