Hardness can be defined as a material's resistance to indentation. Hardness testing is an important step in many industries around the world, including metals, fiberglass, plastics, and rubbers; it is often used to certify quality of materials, test repairs, and can indicate potential coating failure.

DeFelsko offers digital and analog hardness tests in compliance with three different recognized hardness test methods: Shore (A and D), Barcol, and Pencil (Wolff-Wilborn) Hardness.