What are the actual read and write ranges for a typical RFID tag?
The read range of passive tags (tags without batteries) depends on many factors: the frequency of operation, the power of the reader, interference from metal objects or other RF devices. In general high frequency tags are read from about three feet and UHF tags are read from 10 to 35 feet. The write range is based upon the type and size of the transponder. It can range between 40 to 80% of the read distance. The ability to read an RFID device is greatly reduced when mounted on liquids and metals.
