Massachusetts Scale Certification & Weights and Measures

Massachusetts uses a combined model: state inspectors cover much of the state, while municipal (city and town) sealers handle inspections in their own communities. If you operate a commercial scale in Massachusetts — at a warehouse, farm, recycling yard, retail store, or truck stop — here is who regulates it, what the law requires, and exactly who to contact.

Who inspects commercial scales in Massachusetts?

Hybrid: municipal Sealers of Weights and Measures inspect in roughly half of Massachusetts' 351 cities/towns (municipalities over 20,000 residents must appoint their own Sealer), while DOS compliance officers inspect in the other half (towns of 5,000 or fewer by statute, M.G.L. c. 98 s. 35; towns of 5,000-20,000 may contract with DOS). Owners contact their locally appointed Sealer first, or DOS (617-727-3480) where the state services the town.

What Massachusetts requires of scale owners

Commercial weighing and measuring devices must be tested, sealed and inspected by the municipal Sealer or DOS compliance officer serving the municipality; owners can identify who serves their community via the state license-lookup tool (madpl.mylicense.com, profession 'Standards', license type 'Weights and Measures Inspector'). Massachusetts publishes no statewide device-registration portal and no scale-service-company license.

Getting a scale into service — 4 steps

1. Buy a legal-for-trade (NTEP-certified) scale appropriate for your application and capacity.
2. Confirm your jurisdiction — call the state program at (617) 727-3480 to learn whether a state inspector or your city or town sealer covers your location.
3. Arrange compliant installation and calibration. Where required, placing-in-service must be done by a licensed or registered service company.
4. Stay compliant. Pass required inspections, keep calibration current, retain service records.

Common questions