As far as monitor calibration software/hardware goes, this is at the bottom of the barrel. It's not to say the product isn't good for the money but it's very hit and miss as far as an accurate reading goes. It will work brilliantly on some monitors and show a horrible red or blue cast on others as it over corrects. I still can't understand why. I've also come to realize that just about every one in about five of this piece of hardware that comes out of the factory has an inaccurate eye causing it to read false on ALL monitors. I've found this out from reading TONS of reviews.If you want something really worth keeping, you're going to have to throw out a good $250.00.