Operator, organizational, field, and depot maintenance manual : wattmeter AN/URN-120.

"October 1961."

DS and GS maintenance manual : wattmeter ME-82/U.

"20 November 1964."

Operator, organizational, direct support, and general support maintenance : wattmeter AN/URM-120A, (Sierra 164B-G3), (NSN 6625-01-039-1488).

"12 May 1980."