Nikon Z 9 Reference Manual page 166

A
The Information Display
To choose a white balance setting using the
command dials, press the U button while
shooting information is displayed. The selected
setting can be fine-tuned using the multi
selector.
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White Balance Fine-Tuning
The colors on the fine-tuning axes are relative, not absolute. Selecting more
of a color on a given axis does not necessarily result in that color appearing
in pictures. For example, moving the cursor to B (blue) when a "warm"
setting such as J [Incandescent] is selected will make pictures slightly
"colder" but will not actually make them blue.
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"Mired"
Values in mired are calculated by multiplying the inverse of the color
temperature by 10
greater difference in color at low color temperatures than it would at higher
color temperatures. For example, a change of 1000 K produces a much
greater change in color at 3000 K than at 6000 K. Mired is a measure of color
temperature that takes such variation into account, and as such is the unit
used in color-temperature compensation filters.
E.g.: Change in color temperature (in Kelvin) : Value in mired
•
4000 K–3000 K = 1000 K : 83 mired
•
7000 K–6000 K = 1000 K : 24 mired
White Balance
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. Any given change in color temperature produces a