It applies to cross-sections viewed under optical light microscopes.
Most modern quality control laboratories utilize digital systems for this method. astm e2109-01 pdf
The official PDF is a copyrighted publication available for purchase and download from the ASTM website and its authorized global distributors. Prices typically range from for a single-user PDF. Here are the most reliable sources: It applies to cross-sections viewed under optical light
Improper polishing can create "artifacts" (like pullouts or smearing), which may look like pores and lead to false measurements. astm e2109-01 pdf
Type of powder used and substrate material.
