Material Testing

The Wolff/Wilborn pencil test uses constant pressure and variable hardness of the graphite lead as its fundamental principle. Pencils of varying hardness, starting with the hardest lead, are moved over the surface under a fixed pressure of 7.5 Newtons (765g2%) and at a fixed angle of 45 degrees to the surface.

Uni Mitsubishi Hi-Uni Pencils

Elcometer 3086 Motorised Pencil Hardness Tester can travel forwards (chip method) or backwards (indentation method), as required.