FAQ > RFID Tags > What are the general limitation of RFID tags?

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There are two major obstacles when it comes to the usage of RFID tags to track assets : Water and Metal.
Water's physical properties will cause it to absorb RF signals intended to reach, and be transmitted from, your RFID tag. This causes a significant problem when tracking anything that has even a moderate water content. An adult human is made of approximately 70% water, therefore tracking a human with RFID is not the easiest of tasks. That is not to say that RFID cannot be read at all through water, but the read range is extremely short if there is a successful read at all.
Metal has a different effect on an RF signal in that metal will reflect RF signals. This limitation can pose a significant issue when attempting to track a wide variety of items that contain metal, but fortunately there are tags designed specifically to be used on such items. Our Nox TM-series of tags works with the physics behind how metal interacts with RF in such a way as to nearly eliminate the limitation.

Last updated on August 30, 2011 by Customer Support