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Optical Parallel

Both surfaces are finished to perfect flatness and in parallel.

By observing light wave interference fringes caused by the contact surface, the degree of flatness and parallelism of the measurement surfaces of measurement instruments and certain measurement tools can be checked.

Specifications
Diameter: 30mm
Thickness: 12mm, 12.12mm, 12.25mm, 12.37mm
Flatness: within 0.1µm
Parallel level: within 0.2µm