1. Measurement Contexts
- Surface Roughness when the risk is in the texture — stylus testers for parameter-based Ra and Rz work on machined, ground and polished parts, and profile gauges for the anchor pattern on blast-cleaned steel before coating.
- Gloss Measurement where it is the reflected appearance that matters — single-, dual- or tri-angle meters chosen by the 20°, 60° and 85° geometry the finish range and the specification actually require.
For the dry-film thickness of the paint, powder or plating later applied over the prepared surface, where the substrate decides which gauge is valid, continue under Coating Inspection.