On a measuring area the height of the control point is to be measured with a mechanically contacting instrument before and after the desolution of the coating from the basis material. The differnce of the height is equivalent to the coating thickness.
DIN 50933:1987 history
2015DIN 50933:2015-08 Measurement of coating thicknesses - Measurement of the thickness of coatings by difference measurement using a stylus instrument
2015DIN 50933:2015 Measurement of coating thicknesses - Measurement of the thickness of coatings by difference measurement using a stylus instrument
1987DIN 50933:1987 Measurement of coating thickness by differential measurement using a stylus instrument