The devise I'm using came bundled with a P221w Nec Monitor - sorry I'm not at my work station. It works fine calibrating my PA227W, but will not work with my macbook pro retina display. I was thinking about something like a Syder 5 express? For printing or fine tuning images I will always use my NEC monitor. What I'm saying is I don't want to pay $200.00 to calibrate a laptop screen, but I would like to at least calibrate it. Thanks for your response.