Up for sale is ONE Ocean Optics SMA connector with a 50um slit inside. It is genuine Ocean Optics and it works great.  It will fit almost all the Ocean Optics spectrometers before they introduced their "user changeable slit" design.  Thank you.   

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.