We also have pantone color charts printed at the shop. We have found it doesn't really matter what the screen shows, it matters what the printer prints on specific materials. The calendared and cast color charts are different and so we match against what type of material we will be printing on for the job at hand. We start there and then adjust as needed.
If you have outside sales, it's not a bad idea to print them a couple charts to keep with them.
I use my chart in a couple ways; I have found out the hard way when a customer says (for example) "Navy Blue", everyone seems to have
a different version of blue in their heads for Navy Blue, so I make them pick a color off my chart.
I also have scaled down prints of the chart, that a customer can take with them, usually for their wife to look at.
If someone calls out PMS 282 (for example), I take out my PMS book and find the color on my chart that matches that color best, it could be an entirely different #,
& I might have to tweek it, but it gets me close.