Mass. Gen. Laws ch. 164, § 115: Easy ascertainment of gas meter reading

Section 115. Meters for measuring gas supplied to consumers shall register the quantity of gas passing through them in cubic feet so that the number of cubic feet of gas consumed may be easily ascertained by the consumer thereof. No meter shall be used which may confuse or deceive the consumer in ascertaining the price he pays per thousand cubic feet or the number of cubic feet consumed.