Apple 850AV Computer Monitor User Manual

Finally, you can use DigitalColor Meter to identify the RGB (red, green, blue)
values your computer uses to create colors.
Opening DigitalColor Meter
Choose DigitalColor Meter from the Apple (K) menu. (It was installed with
your AppleVision software.)
When you launch DigitalColor Meter, its window opens on your monitor.
See DigitalColor Meter Guide (located in the Guide [h]menu when the
DigitalColor Meter application is active) or the Monitors & Sound doc.pdf
file for more information on how to use DigitalColor Meter.
Installing and Using AppleVision Software