Supply Of Procurement Of Iiw V1 Test Block.Procurement Of Iiw V1 Test Block., Iiw V1 Test Block, As Per Is-4904:2006, Material Mild Steel With Calibration Certificate ( 02 Years Validity ) From Npl With Satisfactory Result, Specification As Per Is-4904, Cl 03 & Cl 04. Make - Modsonic / Similar.