A number of measuring and test methods can be used to determine the mechanical properties of films and surfaces. Micro and nano-indentation for example can be used to determine the hardness and modulus of elasticity for films in the micrometer and sub-micrometer range. Mechanical internal stresses in crystalline materials can be determined using X-ray diffraction. The adhesion strength of the film on the substrate is another very important mechanical parameter for films. It can be determined with the scratch or Rockwell test on hard materials. The film thickness is also among the essential basic parameters that are determined. A whole range of methods is available here depending on the material, thickness, substrate, geometry and so on, each of which delivers optimum results for different applications. Tensile and bending tests can simulate specific tensile loads for coated components.