The testboy 72 layer thickness measuring device is characterised by its high measurement accuracy as well as its very easy and secure handling its robust plastic housing is uv resistant and waterproof all non magnetic coatings such as paints enamel chrome copper zinc etc on steel or iron as well as all insulating coatings such as paints plastics enamel etc on non magnetic metallic substrate for example on aluminium copper or brass can be measured the integrated measured value m