Division III PROVISIONS CONCERNING SIZING
United Kingdom
Size is determined by the weight per unit. The minimum weight is fixed at 1 kg.
When watermelons are presented in packages, the difference in weight between the lightest and the heaviest unit in the same package should not exceed 2 kg, or 3,5 kg if the lightest unit weighs 6 kg or more.
This relative uniformity of weight is not compulsory for watermelons presented in bulk.