Koodhka adag ee birta waa H. Marka loo eego hababka tijaabada adag ee kala duwan, matalaada caadiga ah waxaa ka mid ah Brinell (HB), Rockwell (HRC), Vickers (HV), Leeb (HL), Shore (HS) engegnaanta, iwm. HB iyo HRC ayaa inta badan la isticmaalaa. HB waxay leedahay kala duwanaansho ballaaran ...
Sii akhri