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Can RFID Pass Through Metal?
How could I get around sealed metal containers?
Radio frequency identification cannot pass through metal. In a passive RFID system, radio waves sent by a reader to power up a tag would bounce off metal and never reach the tag; thus, it would not be able to respond. An active tag inside a solid metal container would hit that container's walls and bounce around inside, never reaching a reader antenna on the outside. If you have tagged objects inside a container, you would need to put a reader inside it in order to read the items' tags, and then have a CAT-5 cable connected to a PC outside of the container in order to collect the data.
—Mark Roberti, Founder and Editor, RFID Journal
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