The B246HQL has a maximum contrast ratio of 100000000:1. That's over twenty times the contrast ratio of a 5000000:1 PC display, which is the most common contrast ratio.
A 100000000:1 dynamic contrast ratio is actually the best contrast ratio across all medium monitors that have been around for around the same time as the B246HQL.
A Mega Contrast dynamic contrast ratio is the worst contrast ratio amongst comparable types of PC display.
We think you might also be interested in some of the other flatpanel monitors that have a 100000000:1 dynamic contrast ratio currently available including a cheaper PC monitor such as the Asus VP247T (£124.09) or you might consider a higher rated PC monitor such as the Acer G277HL (£144.97).