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The Postal Service is reminding customers that metallic mercury and devices containing metallic mercury are always prohibited in the mail stream. This includes antique items such as thermometers, barometers, blood pressure monitors and similar devices.

Mailing Standards of the United States Postal Service

Downloadable Versions

Domestic Mail Manual (DMM)

PDF file approximately 9 MB

Quick Service Guides (QSG)

PDF file approximately 5 MB

International Mail Manual (IMM)

PDF file approximately 11 MB
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