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New Jersey law is instructive. Under UCC 1-101 et seq., a seller has the duty to deliver goods that conform precisely to the contract. The seller is under such a duty to make a 'perfect tender' and that a buyer has the right to reject goods that do not conform to the contract. 

In the nineteenth century, sellers were required to deliver goods that complied exactly with the sales agreement. See Filley v. Pope, 115 U.S. 213, 220, 6 S.Ct. 19, 21, 29 L.Ed. 372, 373 (1885) (buyer not obliged to accept otherwise conforming scrap iron shipped to New Orleans from ...