Iowa Code § 215.6: False weights or measures.

If any person engaged in the purchase or sale of any commodity by weight or measurement, or in the employment of labor where the price thereof is to be determined by weight or measurement of the articles upon which such labor is bestowed, has in the person’s possession any inaccurate scales, weights, or measures, or other apparatus for determining the quantity of any commodity, which do not conform to the standard weights and measures, the person shall be punished as provided in chapter 189.