You should be able to see the following:
A gray scale with 20 different sections
The darkest section pure black
The lightest section pure white
No hint of any color in the gray tones
If you don't see all of the 20 sections, use your monitor's contrast settings or the "Gamma" slider to correct this. If black is not pure black, try to darken the monitor, if white is not pure white, try to lighten it. If you see any colors in the gray tones alter the color balance settings of your monitor or the "Red", "Green" and "Blue" slider.
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