The Acer G247H 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 frequently found contrast ratio.
A 100000000:1 dynamic contrast ratio is actually the best contrast ratio amongst all flatpanel monitors of this age and spec.
Amongst comparable types of PC display the worst contrast ratio is Mega Contrast.
There are a number of other PC displays that have a 100000000:1 dynamic contrast ratio currently available that you might want to look at including because of it's better review score, the Acer G276HLA, or the Neovo FM-27.