Gossen Mavo-Spot 2 USB User Manual
Page 13

GOSSEN Foto- und Lichtmesstechnik GMBH
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4.3.2
Percentage Deviation %A
This function is used, for example, for testing monitor screen uniformity (percentage deviation of screen corners
from the reference value at the middle of the screen).
Depending upon the respective results, the minus sign (-) must be observed.
etc.