In article , Tony Cooper
wrote:

I know someone who sells beads on the internet. She uses an X-Rite
color checker to make sure the color in the photo is the color of the
bead, but doesn't have a calibrated monitor. The print will be
accurate even if the monitor and print differ in look.

no it won't, other than sheer luck.

maybe her beads are magic beads.

I will inform her that what she's been doing successfully for quite
some time is wrong according to the person who knows everything even
though he has no personal knowledge of the situation.

tell her to buy a lottery ticket. she's incredibly lucky.

unless she has a calibrated display, it's pure luck that anything
matches. if she replaces any component, she's in for a very big
surprise, and not one she's going to enjoy.