7 Pa. Code § 1.250
On packages containing one pound or one pint and less than four pounds or one gallon, the statement of net quantity shall be expressed as a dual declaration both in ounces and immediately thereafter in parenthesis in pounds, with any remainder in terms of ounces or common or decimal fraction of the pound, or in the case of liquid measure, in the largest whole units with any remainder in terms of fluid ounces or common or decimal fractions of the pint or quart. On random weight packages, however, the statement shall be expressed in terms of pounds and decimal fractions of the pound carried out to not more than two decimal places, for packages over one pound, and for packages which do not exceed one pound the statement may be in decimal fractions of the pound in lieu of ounces.
7 Pa. Code § 1.250
This section cited in 7 Pa. Code § 1.253 (relating to multiunit retail packages); and 7 Pa. Code § 1.255 (relating to exemptions from quantity statement requirements).