The highest contrast ratio of the Hannspree HL249DPB is 30000000:1. That's 50% more contrast ratio than a 20000000:1 PC monitor, which is the most frequently found contrast ratio. PC displays that are a similar age to the HL249DPB dynamic contrast ratios range from Mega Contrast to 100000000:1.
It may also be worth also looking at one of the other PC displays that have a 30000000:1 dynamic contrast ratio currently available including the Wortmann AG 3031200, the Hannspree HL229DPB, or the V7 L27000WHS-9E which has a better Rating.
If the contrast ratio of this medium monitor is too low for you then you might want to consider the HE225DPB (40000000:1), the HW246HBB (40000000:1), or the HE247DPB (40000000:1) all from Hanns.G which also has a higher rating.