Diffraction Grating (Hilger & watt Type)
AVI-P1345/115000 Lines per inch, (600Lines/mm) (Routine Quality)
AVI-P1345/215000 Lines per inch, (600Lines/mm) (Superior Quality)
AVI-P1345/325000 Lines per inch, (1000Lines/mm) (Superior Quality)
AVI-P1345/4 Laser Grating,100/250/500 LPI (Any One)
AVI-P1345/5 GRATING HOLDER WITH ROD