The HS241HPB has a maximum contrast ratio of 80000000:1. That's over sixteen times the contrast ratio of the most frequently found dynamic contrast ratio of 5000000:1. PC monitors of this age and spec dynamic contrast ratios range from Ultra Contrast to 100000000:1.
Alternative flatpanel monitors that have an 80000000:1 dynamic contrast ratio currently available that you might also want to look at include the VX239H (£155.02), the MX259 (£169.99), or the VG248QE (£219.97) all from Asus which has a better Rating.
If the contrast ratio of this medium screen size LCD screen is too low for you then you might want to look at the K242HQL (£108.72) (100000000:1), or the G257HU (£292.80) (100000000:1) both from Acer which is also higher rated.