Attached Link: http://www.bhphotovideo.com/c/product/838845-REG/Datacolor_S4EL100_Spyder4Elite_Software.html

Buy a Spyder 4 here at this link. I run four 27" monitors for my products and use a spyder 3 unit and all four of my monitors are perfect. Well as perfect as a Samsung SyncMaster SA550 can get.

Cost right now is around 250.00 but they do go on sale once in a while. well worth the money, IMO.

Tom