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Optical Flats are used as a reference (test plate) against which the flatness of an unknown surface may be compared. Each piece is precision polished by our master opticians and tested on a Zygo interferometer to insure the surface accuracy. The secondary surfaces of our single surface flats are pitch polished to window quality for viewing the interference pattern. Each flat ships in a durable storage case for permanent protection. 1/20λ flats also include a certificate of calibration.