215.19  Automatic recorders on scales.
  Except for scales used by packers slaughtering fewer than one hundred twenty head of livestock per day, all scales with a capacity over five hundred pounds, which are used for commercial purposes in the state of Iowa, and installed after January 1, 1981, shall be equipped with either a type-registering weigh beam, a dial with a mechanical ticket printer, an automatic weight recorder, or some similar device which shall be used for printing or stamping the weight values on scale tickets.
[C66, 71, 73, 75, 77, 79, 81, §215.19]