N.Y.C. Admin. Code § 20-607: § 20-607 Comparison of testing equipment.

All persons dealing in, trading in, selling, receiving or repairing condemned, rebuilt or used weighing or measuring devices, shall submit their testing equipment at least once a year, to the testing station of the department for comparison and calibration with the prime standards maintained by such department, after which the department shall issue to such person a statement or certificate of its findings.