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Specifications

Specifications: 1) Material: BK7 grade A optical glass 2) Dimension tolerance: +/- 0.2mm 3) Thickness tolerance: +/- 0.2mm 4) Flatness: lambda/4 at 632.8 nm per 25mm 5) Surface quality: 60-40 scratch and dig 6) Parallelism: 1 arc minute