I quickly looked around so I hope I am not asking a question that has already been asked. I have a calibration tool...it is old and outdated (eye one-old). I was looking to purchasing a new one. i see the two you recommend. I was wondering though the one I have now seems to not calibrate both screens I use. i use two monitors and I only calibrate the one I work on. Is that what I should be doing? Or do I need to look into one that does two screens? and do either of the ones you recommend work with two screens?