APPLIED IMAGE precision Ronchi Rulings are generated using our unique semiconductor pattern generator devices. The result is an extremely accurate ruling with smooth line edges and square edge-profile using our unique RAZORedgeTM technology. Standard rulings are available on optical grade soda-lime glass substrates, white opal glass, transparent polyester film or photographic paper. Rulings can be supplied on other materials such as B270, quartz or BK-7 glass as well as at other frequencies or sizes. Contact APPLIED IMAGE for availability of rulings in English frequency metrics (Cycles per inch).