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Ronchi 80 LPMM 0.5" X 0.5" The Ronchi Ruling pattern (also called a diffraction grating) consists of equally spaced alternating clear and opaque bars. The spatial frequency of the ruling is typically expressed in Line Pairs per MM or Line Pairs per Inch.The pattern is printed in Chromium (OD > 3.0) on 1.5mm thick Soda Lime Glass and extends to the edge of the glass. The transmission tolerance for the 80 LPMM pattern is ±5%. Click here to download drawing Call for pricing.(800)798-3675 Show more