The highest contrast ratio of the Acer K222HQ is 100000000:1. That's over twenty times the contrast ratio of the most common dynamic contrast ratio of 5000000:1.
This PC monitor's contrast ratio (100000000:1) is in fact the best contrast ratio across all PC displays of a similar age and type to the K222HQ.
A Mega Contrast dynamic contrast ratio is the worst contrast ratio across comparable types of PC monitor.
It may also be worth also looking at one of the other PC displays that have a 100000000:1 dynamic contrast ratio currently available including the Acer H277HU (£269.99) which has a better Rating.