# Metal mercury (mercury thermometers, barometers, blood pressure monitors) — Postal shipping restrictions by item category

For Metal mercury (mercury thermometers, barometers, blood pressure monitors), carrier is USPS; restriction type is prohibited; scope is all mail; conditions is USPS never allows metal mercury to be mailed, recorded from its source on 2026-08-04.

- **Item category:** Metal mercury (mercury thermometers, barometers, blood pressure monitors) _(unconfirmed — we could not tie this to the quote below)_
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** prohibited _(our reading, not quoted from the source)_
- **Scope:** all mail _(our reading, not quoted from the source)_
- **Conditions:** USPS never allows metal mercury to be mailed _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Note the USPS never allows explosives or metal mercury (such as mercury thermometers, mercury barometers, mercury blood pressure monitors) to be mailed.

## Source

- https://www.ecommercebytes.com/2026/07/05/new-usps-noncompliance-fee-could-take-sellers-by-surprise/

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).