Whiteness Index (WI) displays XXX.X

When taking a measurement for Whiteness Index (WI) the instrument must be set to one of the following illuminant/observer combinations (per ASTM E313-98):

C/2°,  C/10°,  D50/2°,  D50/10°,  D65/2°,  D65/10°

Setting the instrument to any other illuminant/observer will cause the output to be XXX.X

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