ʻO Rockwell & Superficial Rockwell Hardness Block ʻO Brinell Hardness Block Pale Paʻakiki ʻē aʻe ʻO Vickers & Micro vickers Paʻa Paʻakikī Indenter Makamaka & Pahuhopu ʻO Leeb pāʻoihana Mea hoohana metallographic