The HP Z model spectrometers have a white LED as their light source, with no UV content, so they do not measure into UV and their spectral export does not have data beyond 400-700 NM. I have seen the Z's spectrometer described as being simular to: 1/ the Eye 1, which has a tungsten light source with some UV content, cut out in the UV-cut version. 2/ the iSis, which has a UV Led and a white non-UV LED, using them separately. 3/ the Colormunki in a recent message, one white non-UV LED. Which spectrometer comes near the Z's model, light/sensor/grating? I do not know, could be half the iSis, a whole ColorMunki but an Eye 1 is unlikely given the light source. It also measures from a greater distance on larger patches, I think the illumination must have been increased. -- Met vriendelijke groet, Ernst http://www.pigment-print.com/spectralplots/spectrumviz_1.htm April 2014, 600+ inkjet media white spectral plots.