I spent the last 5 days analyzing a crude oil sample to further validate the DH 4.2 (build 4.0.1) spectrometer, and I have posted my research results at Public laboratory ( it would have been a little too much to post here,) so here is the link if you are interested.

http://publiclab.org/notes/dhaffnersr/05-18-2016/crude-oil-analysis-sweet-crude-laramine-county-carpenter-wyoming-usa

Not too bad for the money!!

Thanks Dave H