This successful and extremely useful scratch hardness tester is in the form of a pocket instrument. Also for tests on curved surfaces. Carbide ball tip, diameter alternatively 0.5/0.75/1.0 mm. Spring force 0 – 20 N divided into 3 measuring ranges.  (Model 318S designed with rolling head)  This instrument has been designed for the measurement of the hardness of protective coatings. The degree of hardness of paint films, plastic coatings, etc. can be accurately measured and recorded with the Hardness Test Pencil, Models 318, 318 S and 318 C, no matter whether on a level or curved surface, small or large.

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