Preference Karabük Iron and Steel Foundry machines and EQUOTIP 3 Portable Hardness Tester Portable Hardness Tester Type Probe and Reference Block G was included in the basic unit a. Non-homogeneous parts, such as cast iron and Ductile Iron Fittings, Brinell-based measurements is about 5 times more energy-producing standard D probe and 5 mm. based on the measurement of Brinell ball, even with the uneven surfaces, which results in more accurate measurements EQUOTIP 3 unit of measurement units is included in the S probe.