Buy from Amazon.com : http://fave.co/1EwUAxt

Datacolor Spyder4Express S4X100 Display Calibration Device

Product Description :
Automated Color and Brightness Calibration
Full-spectrum color sensor
Simple calibration for single display
Improved accuracy and stability - The fourth-generation Spyders have double-shielded color filters for even closer match to CIE color standards and improved long term stability Average accuracy is up 26 and consistency between Spyder units is 19 better