Supply of Hardness Test Calibration Block Size-100Mm X 100Mm X 16 Mm, Hardness Range:- 250 To 300 Bhn, Suitable For Test Method 10 Mm/3000 Kgf. Material:- Fine Grained Homogeneous Steel, Form:-Square, Maximum Allowed Variation Of Hardness Value:- ? 4Bhn, Accuracy: More Than 95%, Block Should Have Demarcation Line For Indentation. Block Shall Have A Valid Calibration Certificate As Per Din En Iso 650/3..