As Per IS 383:2016 (Clause 8)

8. SUPPLIERS CERTIFICATE AND COST OF TESTS

8.1 The supplier shall satisfy himself that the material complies with the requirements of this standard and, if requested, shall supply a certificate to this effect to the purchaser.

8.2 If the purchaser requires independent tests to be made, the sample for such tests shall be taken before or immediately after delivery according to the option of the purchaser, and the tests carried out in accordance with this standard and on the written instructions of the purchaser.

8.3 The supplier shall supply free of charge, the material required for tests.

8.4 The cost of the tests carried out under 8.2 shall be borne by,

a)  the supplier if the results show that the material does not comply with this standard; and

b)  the purchaser, if the results show that the material complies with this standard.

                                                                                                                                      -(Ref IS 383:2016)

                                                                                                                                      - Team M-Kube