Thickness gauge for surface measurement with a high measurement range and a V-groove on the measuring head. The PCE-CT 27FN thickness gauge is designed to determine layer thicknesses. The measurement of layer thickness is performed on metallic substrates and measures both ferrous and non-ferrous metals. This allows for the inspection of paints, colors, plastics, and similar materials. The thickness gauge is primarily used for quality control measurements on workpieces. Since the thickness gauge measures non-destructively, the test piece remains usable after measurement. In addition to quality control, the thickness gauge can also be used for incoming goods inspection. It is designed for measuring non-magnetic coatings such as paint, plastic, chrome, copper, zinc, enamel, etc., on steel and iron. It is also suitable for measuring all insulating layers such as paint, plastic, enamel, paper, glass, rubber, etc., on copper, aluminum, brass, and stainless steel, as well as anodized aluminum.