Nikon First Order Red Compensator Instructions for Labophot Optiphot available by download or on CD with 6 pages of descriptions for polarizer alignment. Instructions on the analysis and identification of crystals such as Uric Acid and Calcium Pyrophosphate in synovial fluid to diagnose Gout or Pseudo Gout. All scans are in black & white. This manual is loaded with information!  Item# L0198