NOTE 1 Attention is drawn to ISO 4545, ISO 6507‑1, ISO 6507‑2 and ISO 6507‑3, which describe Knoop and Vickers hardness testing of metallic materials. Other International Standards for instrumental indentation testing, the verification of microindentation testing instruments and for the verification of reference blocks to be used with such instruments are currently being developed (e.g. ISO 14577 Parts 1 to 4).

NOTE 2 Usually for hardness measurements of coating test forces in the microhardness range in accordance with ISO 6507‑1 are used. However, since the largest possible test force should be selected, test forces of the low force and hardness ranges may also be used.