The Department plays a critical role in Arizona's marketplace by protecting consumers and retailers from unfair business practices. Ensure that commercial devices (scales, taxi, vapor recovery, liquid petroleum gas, etc.) used for the sale of commodities by weight, measure or count are licensed and accurate. To learn more visit the Consumer Tips and Business Center pages. House and maintain the state's primary standards (those measurements upon which all other measurement is based). Visit the METROLOGY page.Prevent unfair dealing by weight, measure or count. For all inspection procedures found in the National Institute of Standards and Technology (NIST) Handbooks and all Weights & Measures Statutes and Rules visit the LEGAL page. Ensure proper labeling of products sold by weight, measure or count (a gallon of gas is a gallon, your breakfast cereal weighs 20 oz. as stated on the package, etc.). Ensure that prices are posted and items scan correctly. Visit the PRICING TIPS page or the UPC PRICE POSTING page. License weighmasters who are responsible for weight certification. Visit WEIGHMASTER to learn about the weighmaster licensing process. License Registered Service Agencies and their representatives who are responsible for the installation and repair of measuring devices in the marketplace. Visit the RSA/RSR page to learn more.