This is a black and white tonal range chart.

When you view this chart on your monitor you should NOT see any color tint, i.e. magenta, purple, green, etc.
If you see any color toning, your monitor is not claibrated and you will not be viewing images properly.

You SHOULD be able to see the subtle differences in the step wedges of the gray scale.

Example, if you can not see the difference between the Black 8 and Black 16, or White 247 and White 255,
your monitor might not be calibrated or is getting old and loosing definition.