N.J. Stat. § 51:1-77.1
Notwithstanding any other provision of law to the contrary, a public weighmaster appointed pursuant to R.S. 51:1-74 shall certify the tare weight of a vehicle used for the transportation of construction materials when requested to do so by the operator of that vehicle. The weight of a commodity transported by such a vehicle shall be determined by subtracting the certified tare weight of the vehicle from the gross weight of the vehicle. It shall be sufficient and not a violation of this Title for the tare weight of the vehicle to be certified no more than seven days immediately prior to the date the gross weight of the vehicle is determined. In the event that the tare weight of the vehicle has not been certified during the seven-day period provided for in this section, it shall be sufficient and not a violation of this Title for the tare weight to be certified by a public weighmaster other than during the immediately preceding seven-day period, provided that the certification shall occur not more than one year prior to the date the gross weight is determined and further provided that, if there should be a subsequent examination and weighing, the subsequent tare weight of the vehicle is no greater than 105 per cent or less than 95 per cent of the tare weight certified during the one year period. A certificate issued by a public weighmaster pursuant to this section certifying the tare weight of a vehicle shall contain the wording "stored tare." Such a "stored tare" certificate shall not supersede a certificate setting forth the weight of a vehicle which results from a weighing on certified scales that produces a weight of record. Construction materials not sold or intended for sale to an entity distinct from the seller shall not be considered a commodity for purposes of this Title. It shall be sufficient and not a violation of this Title for vehicles carrying such construction materials to have only the gross weight of the vehicles certified. As used in this section, "construction materials" means naturally occurring aggregates, including but not limited to top soil, crushed stone, gravel, sand, clay and clean fill.
N.J.S. § 51:1-77.1