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Tags designed to work on metal use spacers to keep the antennas away from metal objects, in order to prevent the antennas from being detuned. Such tags, when applied to metal, can be interrogated like any other tags. As long as the reader and the tag operate at the same frequency band and use the same air-interface protocol (the language with which tags and readers communicate), then you should be able to read on-metal tags on scaffolding. That being said, the placement of the reader antennas, the orientation of the tag antennas to the reader antennas, multipath and other factors could affect your ability to interrogate tags effectively and consistently, just as they would if you were reading a regular tag on an RF-friendly material.
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