Hardness test blocks from CV Instruments provide reliable calibration for all major hardness scales. Available with UKAS, DKD, DKD/MPA, and ASTM certifications, they are suitable for both laboratory and industrial use. By matching the material and hardness range of the test specimen, these blocks enhance accuracy and reliability in quality management. Aluminium-based “soft” blocks further extend calibration capability where conventional steel cannot be applied, offering a complete solution for hardness testing requirements.