Why measuring gloss?

The effect from gloss is much important for the visual colorimetry. The same black sample appears lighter with a matt finish than a glossy finish.

So measuring the colour alone is often not enough. ColorLite offers the spectrophotometer sph xs1 which combination to measure the colour and the gloss.

The measurement of gloss is made by a defined illumination of the sample surface.  The reflected light then gets measured in 60 degrees angle.