Meters for measuring electricity for lighting purposes supplied to consumers shall register the quantity of electricity passing through them in kilowatt hours, so that the number of kilowatt hours consumed may easily be ascertained by the consumer.
Mass. Gen. Laws ch. 164, § 118
Easy ascertainment of electric meter reading
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.