DC: Exterior dimension: f20 * 86mm, weight: 50g. The impact device is short and is mainly used in very cramped places such as holes or cylinders D + 15: Dimensions: f20 * 162mm, weight: 80g. Small head for groove or concave surface hardness measurement C: Overall dimensions: f20 * 141mm, weight: 75g. Minimal impact energy, used to measure small, light, thin parts and surface hardened layers G: Overall dimensions: f30 * 254mm, weight: 250g. Large impact energy, low requirements for measuring surface. For large, heavy and rough surface forgings E: Dimensions: f20 * 162, weight 80g. The indenter is artificial diamond. It is used for the determination of extremely hard materials