Profilometer

An instrument for determin­ing the profile or roughness of a material’s surface (e.g., the bore of wiredrawing dies. It consists of a feeler arm reflecting any up and down movement of the feeler that can then be translated into the required outline of the die profile. Also, used to measure the depth of surface defects, such as pits, on bar and wire. It is a highly accurate tool for laboratory use, usually accurate to 0.0025 mm.