N.J. Stat. § 51:9-2
It shall be illegal to use or to employ any measuring device for use in the purchase or sale of any liquid fuel without the same first being approved as to type and construction by the state superintendent of weights and measures and calibrated, tested and sealed by any weights and measures official. The state superintendent of weights and measures shall provide a form of certificate to be issued by a weights and measures official after the approval, testing, calibration and sealing of any measuring device, which certificate shall expire one year from the date thereof following issuance thereof and shall be renewed annually. It shall be unlawful to sell or deliver or have in possession with intent to deliver any liquid fuel unless such certificate shall be in possession at all times or carried on the vehicle to which it applies.
N.J.S. § 51:9-2