And it's also different between CRT and LCD/LED monitors ....in pro TV studios there are still some CRTs for quality control.
That is mostly for the scanning/refresh part, not for the colour reproduction. Only since 2 years, they start to make custom frequency LCD panels for the higher segment (driven by the demand for 3D though!)
I can also recommend grabbing a Sikkens colour system swatch book at a pro paint supplier. Their colour coding is known by every colour mixer, and it gives you a very accurate swatch set for 25 euro's, holding thousands of colours. Much more useful than stupid RAL swatches.