I can calibrate screen, but unless they give me the Pantone numbers, I'd never be sure. I have Pantone cards.
I've written to a couple of companies to see if they do have a chart either free or for sale. I'd buy it.
I bought some cone thread from Connecting Threads. It was white, so no problem. No one in town sells the larger spools. I use cones on the serger, and can manage just fine with some of the colors they sell. However, it's the color
cast that some threads have. I'd like to get some spools in the basic colors I want, so I don't run out when I can't get any more in the middle of a project.