manual, it would seem it measures it at the time it measures the 3 colors. Perhaps you have had the measuring head off and saw 3 sensors only?
Also, common sense indicates the "X-rite Visual" may be similar to a B&W density reading, but did you see in any documentation that it is indeed "the same as B&W density?"
Anyway, the "X-rite Visual" has my curiosity because my x-rite 890 does not display the "X-rite Visual" output, it just lists the 3 colors. Also, this X-rite document on color standards and measurement does not mention "Visual" or "X-rite Visual": http://www.xrite.com/documents/liter...d_Color_en.pdfEach time a measurement is taken, all four colors (visual, red, green, and blue) are read