Up for sale is one BRAND NEW, NEVER USED, NEVER OPENED 300gr/mm optical grating from Optometrics (now Dynasil) with dimensions of 25mm x 25mm x 9mm.  This grating will fit models like the Ocean Optics HR2000, HR2000+, HR4000, QE65000, and others.  You can expect around a 900nm range, for example from 200nm to 1100nm.  Thank you. 

If you need a good mount for this grating that is only $30 please go here:

https://www.ebay.com/itm/147241308256


Please view the last two pictures for specs and performance chart.  

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