Hotfrog Singapore provides information regarding Hardness Test Blocks. Hardness Test Blocks provides Calibration services. Contact them on 1 978 897 1795 or by visiting them on their website http://www.hardness-testblocks.com.
David L. Ellis Company Inc., We manufacture and distribute hardness testing standards. Brinell scale, Rockwell, Knoop and Vickers blocks. Calibration services