For the inspection of final coatings, dry film thickness gauges are used. Mechanical coating thickness gauges offer many advantages. They are very user-friendly and easy to carry. Robust construction, immediate reading of measurements. Measurements can be made on any surface, whether glass, wood, metal, or plastic, as they use a purely mechanical measurement principle. Mechanical coating thickness gauges are very inexpensive compared to other systems. Wet film thickness gauges are used for inspecting recently applied layers and allow the calculation of the remaining dry film thickness. If deviations from the target value are detected, they can be corrected immediately.