C.R.S. § 35-14-117

(1) Except for random-weight packages unit priced in accordance with rules promulgated pursuant to this article, any retail establishment providing unit price information in addition to the total price for any commodity shall also provide the unit price information for all such commodities as required by rules promulgated pursuant to this article. (2) Either metric or inch pound unit prices may be used for commodities marked in either system; except that, when unit price is changed to metric for any given type of commodity, unit pricing for all sources or suppliers of that commodity should change to metric.