Up for sale is one B&W TEK VIS spectrometer complete with everything you see in the first picture which includes the spectrometer, A/C adapter, and USB to serial cable.  For info on these spectrometers and to download the software please Google "bw-tek-btc100-spectrometer syonyk".   Another site with good info can also be found by Googling "hololaser.kwaoo.me spectrometer".  A final site with tons of info on these spectrometers can also be found by Googling "B&W-tech Spectrometer & 473 module: Setup+Mods+Info".  Although these spectrometers are not wavelength calibrated, after you download the software please follow my instructions in photo #5 and photo #6 to get the spectrometer to start detecting light. 

The way the spectrometers sit now, they will read roughly from 400nm to 650nm.  Please view my 5th picture to see the spectrometer reading a mercury argon light source. Some of the lines you see are strong lines of mercury at 404nm, 407nm, 435nm, 546nm, 576nm, and 579nm.  If you increase the integration time you would also be able to see mercury lines of emission with much less intensity.

If you are interested in any fiber cables that are compatible with this spectrometer, I recommend either of these three Ebay ads:

https://www.ebay.com/itm/143963877114?hash=item2184ea6efa:g:BbkAAOSwWixgPAn6

https://www.ebay.com/itm/144348568371?hash=item219bd85b33:g:624AAOSwOr5hy0up

https://www.ebay.com/itm/143934450240?hash=item2183296a40:g:SfsAAOSwuqlgFsgJ

I have been an eBay member since 2001 with excellent positive feedback. If you have any questions please scroll up and click "contact seller". Thank you.