From the assessment of surface profile through climatic conditions to wet and dry film thickness, there are simple mechanical gauges to assess and monitor the application of a coating. These instruments represent testing methods that can be used particularly where conditions prevent the use of electronic gauges, such as where there are hazardous vapors, which could be ignited by a spark generated by a battery-powered gauge.
The profile is a particularly relevant parameter where the substrate preparation includes grit or shot blasting.