The prolite b2083hsd is a 19 5rsquorsquo 1600x900 led backlit monitor with a height adjustable stand supporting screen rotation ensuring perfect posture and optimal viewing comfort it features 5msec black to black response time and 5 000 000 1 advanced contrast ratio assuring very good picture quality the monitor is tco6 and energy star certified a perfect solution for education local government business and finance markets acr contrast ratio is a measurement of the differe