EXTEC كسارات أستراليا
Hardness Test Blocks. EXTEC ® Micro Hardness Test Blocks. Vickers (HV), Knoop (HK) and Dual (HV/HK) meet ASTM E384 standards and conform to A2LA and NVLAP specifications and are the same load: 100-200 (100 gm load)' 300-800 (500 gm load).