Datacolor Spyder4Elite Colorimeter

This is currently the best display calibration device available. Works on all types of displays (LED, OLED, LCD and CRT displays, laptops and front projectors). I have the previous generation (Spyder3) and love it. I plan on getting this one as well.

Buy it here: Datacolor Spyder4Elite S4EL100 Colorimeter for Display Calibration