Products:
SurCh-Sc allows the inspection of all areas of a bolt or a screw.
Even the hidden surface under the screw head can be thoroughly inspected without disturbing shadows or obstacles.
Under-head surface with a clear scratch.
The image shows the bottom surface (red area) as well as a part of the shaft (with hole). The under-head defects are clearly visible and detectable.
The picture is similar to the previous image. Additional to head-bottom, shank and hole, the first thread rings are visible.