quick question about contrast

[Meteora]

I see some monitors with this term ACM 100,000,000:1(1000:1) why do they use acm and not just the contrast ratio? is it different because on this 23 inch version of the monitor I have it has acm listed but on my 27 inch version its not? What does acm mean?

 

what im talking about(just go done to specifications then to contrast ratio)

http://www.newegg.com/Product/Product.aspx?Item=N82E16824009483&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

http://www.newegg.com/Product/Product.aspx?Item=N82E16824009590

 

[WoodenMarker]

ACM is Adaptive Contrast Management which is the virtual contrast ratio. The spec is irrelevant, bull, just used for marketing, and should be ignored.

[Glenwing]

Contrast ratio specs should be ignored as WM said.  They are basically made-up numbers.