The highest contrast ratio of the HP 27es is 1000000:1. That's 99% less contrast ratio than a 100000000:1 LCD screen, which is the most common contrast ratio. Latest medium monitors dynamic contrast ratios range from Mega Contrast (worst) to 100000000:1 (best).
We compared all the other PC monitors that have a 1000000:1 dynamic contrast ratio to this PC screen and we think the HP 24es (£168.90), and the LG 24MP48HQ-P which is cheaper is also worth considering.
If you are looking for a PC screen with a higher contrast ratio then you might also want to consider the U2413 (£275.00) (2000000:1), or the U2415 (£186.67) (2000000:1) both from DELL which also has a higher rating.