I have a bit of a thing about this since one package showed different colours to the others I use. I've checked shots on other machines. They vary a bit but seem to be ok to me so I have never bothered going any further.
As a colour calibrator is a little pricey for home use I have bought a 2nd hand one sold on the basis of needing a new one to suite a mac upgrade. Hope that is the only reason. £21 isn't to bad for home use if it works. It's a Monaco X-Rite Optix XR - Monitor Colour Calibration Device.
I intend to use it with an open source software called Argyll. That's capable of working with many brands of calibrator. One disappointment is that the unit should have come with an IT8 reflective card. The seller says they will look for it so there is some hope but I need to sort out what I need to do if it doesn't arrive.
The calibrator is supplied with the card so that the software can be used to calibrate a scanner and subsequently a printer. Basically the scanner is calibrated via the card, a file that matches the card is printed and then scanned so that a profile can be generated for the printer as well. My problem is that I have the file to be printed but have no idea what type of IT8 card it is.
I did find an IT8 Agfa tiff file and notice that the white is on the warm side. I would expect Kodak to be more neutral and Fuji to encourage Brit's to look tanned. If I buy a card this leaves me wondering what card should be used for calibration? Could be that the one with the unit is out of date as well. Any ideas?
I'm not sure if Argyll will calibrate a printer this way but it is a very flexible package so for the moment live in hope. However if of use people who work on open source software will often extend it. Biggest problem with Argyll is finding a decent from novice tutorial. Most of what I read about it near gobble de gook to me.