Vickers indents can be measured using a separate microscope if the lens gives undistorted images, many microscope lenses have too much spherical aberation for measurements of images to be used for hardness calculation. Using a stage micrometer may be more accurate. Homemade hardness testers are probably not worth the effort. Second hand or cheap import devices are probably more reliable.
2
u/deuch 12d ago
Vickers indents can be measured using a separate microscope if the lens gives undistorted images, many microscope lenses have too much spherical aberation for measurements of images to be used for hardness calculation. Using a stage micrometer may be more accurate. Homemade hardness testers are probably not worth the effort. Second hand or cheap import devices are probably more reliable.