The ElektroPhysik 80-137-1100 MiniTest 735 Coating Thickness Gauge N0.7-90, 30 Mils / 700 Micros (with 90 Degree Wand Sensor for Measurement Inside Tubes) is the solution to all your coating thickness problems where a reliable finish and perfect product appearance play a major role for long-term value and success, e.g. in the automotive and shipbuilding industry, steel- and bridge construction or in the electroplating industry, to name a few industries.