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For measuring thickness of paint by drilling and making measurement by a camera. The drilling device, digital microscope, specimen illumination and battery are enclosed in a sturdy housing. The 518 USB is connectable to a Windows PC.

The 518 USB operates on the standardized wedge cut method in which the specimen is cut at a defined angle. From the projected width of the cut face the layer thickness can be calculated making use of a simple geometrical relationship. In the measuring microscope a system of concentric circles is visible and from the difference in the radii of the circles which are measured using the measuring microscope, the film thickness can be calculated by multiplying with a known factor.