Pursuant to state law, the Pipeline Safety Division tests each gas meter used in Massachusetts for accuracy. After a gas meter has passed the test, the Pipeline Safety Division seals it with a decal to show that the meter has been approved for use. New meters are tested on a sample basis.
A meter may remain in use for up to seven years. After seven years' use, it must be replaced by a meter that has been newly tested and approved. A meter that has been removed must be tested and approved before it is put back into service.