* 品牌: | 拓博 | * 型号: | HR-150A |
硬度标尺
|
标准块的硬度范围
|
示值最大允许误差
|
HRA
|
(20~75)HRA
|
±2HRA
|
(>75~88)HRA
|
±1.5HRA
|
|
HRB
|
(20~45)HRB
|
±4HRB
|
(>45~80)HRB
|
±3HRB
|
|
(>80~100)HRB
|
±2HRB
|
|
HRC
|
(20~70)HRC
|
±1.5HRC
|