Weights & Measures Division

What We Do

The Division’s primary mission is to promote equity and fairness of Arizona commerce involving weighing or measuring for commercial purposes by regulating and supporting businesses in a manner that protects both the buyers and sellers interests.  The Division carries out its mission by maintaining the State standards of weight and measure based on national standards maintained by the Federal government, licensing weighing and measuring devices used in Arizona, conducting a wide variety of inspection programs to protect the marketplace, and auditing measuring devices and enforcing the statutes, rules, and regulations governing their use.

Mission Statement

To protect the integrity of Arizona’s marketplace by ensuring that equity and accuracy are preserved in commerce through fair and evident regulation and the effective communication of weight and measurement standards.

Objective and Purpose

The Division’s overall objective on the weights and measures front is protecting businesses and consumers via uniform inspection and test procedures, proper licensing of measuring devices, knowledgeable and well trained state investigators, and precise operation of a metrology lab that provides accurate measurements and calibrations for industry to Federal standards. The Division provides a coordinated system to follow up with inspection and procedural guidelines adopted by the National Conference on Weights and Measures (“NCWM”). 

The Division also offers guidance, assistance, and educational programs to encourage the public and private sector to be efficient and compliant. As part of this effort, the Division conducts inspections of regulated facilities on a regular basis and in response to citizen complaints. The Division also pursues informal and formal enforcement actions against regulated facilities to ensure compliance with weights and measures laws.

The Division plays a critical role in Arizona's marketplace by protecting consumers and retailers from unfair business practices. 


  • We preserve and defend the measurement standards in which all commerce is built upon in order to deliver fair competition in the Arizona market place.
  • We ensure that commercial devices (scales,  vapor recovery, liquid petroleum gas, etc.) used for the sale of commodities by weight, measure or count, are licensed and accurate.
  • We work to prevent unfair dealing by weight, measure or count, and the Division conducts regular inspections and investigations of potential fraud in commodities.
  • We maintain the state's primary standards (those measurements upon which all other measurement is based).
  • We 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.).
  • We ensure that prices are posted and items are scanned correctly.  The Department conducts regular inspections to ensure compliance by retail businesses. 
  • We license weighmasters who are responsible for weight certification.
  • We regulate Arizona Cleaner Burning Gasoline; regulate vapor recovery environmental programs.


Contact Us

1688 W Adams St.
Phoenix, AZ 85007

Phone: 602-542-4373

Outside of metro Phoenix: 1-800-277-6675

Fax: 623-939-8586


Who We Are

Michelle Wilson
Associate Director
Joined the Department in 2012, and has over 20 years of experience working on environmental and transportation fuel issues. 

Damien DeSantiago
Compliance Manager, Weights and Measures
[email protected]

DeSantiago rose through the ranks as a field investigator to a Supervisor who has direct oversight of all air and fuel quality inspections and investigations. His responsibilities include supervising 11 field investigators and assisting with departmental hearing, inspection and personnel matters. DeSantiago also has been delegated authority to act for the Director with regards to all inspections and investigations, and shares the duties to conduct informal settlement disputes, among other duties. 


Kevin Allen

Vapor Manager, Fuel and Vapor
[email protected] 

Michele Mellott
Vapor Scheduling and Inspections
[email protected] 

Brian Sellers
State Metrologist
[email protected]
4425 W Olive Ave Suite #134
Glendale, AZ 85302-3843

After 11 years with the Department, in 2010, Sellers took over the full-time duties as Arizona’s State Metrologist having previously worked as a field investigator and the Assistant State Metrologist. The State Metrology Laboratory is the custodian of the measurement standards for the state of Arizona and is one of only 19 nationally accredited laboratories in the nation. Sellers has direct oversight over the operation and management of the lab. Sellers maintains the lab standards which serve as the basis for assuring equity in the marketplace and as the reference standards for calibration services for government, industry and business.

General Licensing
[email protected]

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