Refractometer or Microscope Light Box - Not Sure What This Is.  I cannot find a name or model number on this and I am not exactly sure what it is.  There is a chip in one of the glass pieces on the edge.  See photos.  If anyone knows what this is you can please let me know. 

Inventory Location: 19B-CIN

Inventory ID: G8  

Shelf: 67.6