I want to be able to adjust the brightness on the backlight of a monitor. Similar to what you can do with a Datalux Tracer. How is that done? I notice datalux's tracer has like 680 nits brightness, but their 12.1" touchscreen is like 200. Their 12.1 also appears to lack that adjustment.

I want to get a touch screen from 12.1 to 15" where I can adjust the brightness externally. IE on the datalux tracer you spin the dial (much like the volume controls on many portable players so you can dim/brighten things very easily.