Hardness Meter DUR-O-Test
This pocket instrument allows hardness tests on flat and curved surfaces.
The instrument consists of a sleeve with a pressure spring that can be bent to various tensions by using a slide.
The spring acts on a tungsten carbide needle with its tip extending out of the sleeve. A locking screw fixes the slide, thus maintaining constant spring tension.
Three pressure springs of varying strengths ranging from 0-20 N (0-2000g) are available to cover a large hardness range.

Pencil Hardness Tester (Wolf-Wilburn)
The purpose of scratch hardness tests is to determine the resistance of coating materials or lacquers to scratch effects on the surface. This test is of particular value for furniture or vehicle lacquers, but is also a useful aid in the development of synthetic resins or other film forming materials.
Generally, scratch hardness is measured by moving a sharp object under a known pressure over the test sur- face. The result may either be the value of the pressure required to scratch through the test material if a scratch- ing tool of constant hardness is used, or the hardness of the scratching tool is varied while constant pressure is applied.
Twenty pencils from grade 9B to 9H are used with a standard holder
Pencils are moved over the surface under a fixed pressure and a fixed angle-ensuring the least amount of operator error
Pencils can be easily exchanged to minimize down time during the test.