An assembly for processing fruit and vegetable products includes a plurality of units for containing fruit and vegetable products (A), which can move in sequence along a conveyance line. The assembly includes at least one vision element, arranged along the line and intended at least to check the actual number (N) of containment units on which each product (A) lies and is conveyed along the line, with such actual number (N) being able to depend randomly or otherwise on the size, shape, arrangement and/or method of loading on the line of the respective product (A). Downstream of the element there are at least one first device for weighing a first predefined number (n1) of consecutive containment units and at least one second device for weighing a second predefined number (n2) of consecutive containment units.