Open daily 10 a.m. to 5:30 p.m.
Admission is always free!
2 Massachusetts Ave., N.E.
Washington, DC 20002
The museum's main entrance is located on the corner of First Street and Massachusetts Avenue NE. Other entrances have variable hours.
Erastus and Thaddeus Fairbanks were building scales since the 1830s. Their company became one of the top suppliers of scales to the Post Office Department.