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# Surface Quality Scratch-Dig Definitions
> The Scratch-Dig specification is a highly subjective standard based solely on visible inspection of an optic side-by-side with a qualified standard. All qualified standards trace their roots back to a still existing set of standards kept at Picatinny Arsenal in New Jersey.

**URL:** https://mcdanelmaterials.com/surface-quality-scratch-dig-definitions/
**Type:** Post
**Modified:** 2024-08-06

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[Download PDF](/wp-content/uploads/2024/08/Quality-Scratch-Dig-Definitions.pdf)

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