The highest contrast ratio of the Acer 206HQ is 100000000:1. That's over five times the contrast ratio of the most frequently found dynamic contrast ratio of 20000000:1.
A 100000000:1 dynamic contrast ratio is actually the best contrast ratio across all small monitors that were launched around the same time as the 206HQ.
The worst contrast ratio across comparable types of PC screen is Mega Contrast.
It may also be worth also looking at one of the other PC monitors that have a 100000000:1 dynamic contrast ratio currently available including because of it's better review score, the 192HQL (£59.00), the K192HQ, or the 193HQLHb all from Acer.