Asha Scientific Works



Transmission Type 30 x 25 mm. available 15000 lines per inch. Plate covered with mounted in plastic frame.

Diffraction Grating School quality 25 x 30 mm. 13400 lines per inch mounted in plastic frame.

Transmission type 38 x 50 mm. available 15,000 lines per inch. Replica on glass plate covered with another glass plate.