A good condition X-Rite i1 Studio for profiling printers and monitors. Note that I do not know how this works as X-Riteno longer support it and I now have an i1 Pro 2 instead. I believe there are other software solutions to get results such as ArgyllCMS or Calibrite, but I do not know how to do this and gave up trying.
eBay
Looks like new.
eBay
eBay