N.C. Gen. Stat. § 81A-24: Commodities to be sold by weight, measure or numerical count.

It shall be unlawful to sell, except for immediate consumption by the purchaser, on the premises of the seller, liquid commodities in any other manner than by weight or liquid measure, or commodities not liquid in any other manner than by measure of time, by length, by volume, by weight or by numerical count. When a commodity is sold by numerical count in excess of one unit, the units which constitute said numerical count shall be uniform in size and/or weight, and be so exposed as to be readily observed by the purchaser. (1945, c. 280, s. 1; 1949, c. 973; 1975, c. 544.)