Why should I be concerned about the tag frequency?

PIT tag technology and development is constantly evolving. There are currently three basic tag frequencies. The 400-kHz tag was one of the first developed and it is still in use today, though readers are getting scarce. These tags have a limited read range. As microchip technology evolved, the 125-kHz and the ISO 134.2-kHz tags became available. Compared to the older 400-kHz tags, they have a much better read range and reduced read time. The ISO 134.2-kHz tag was developed to meet international standards for code format. If you are starting a new project and working with different agencies or organizations the tag type and equipment should be compatible. Most readers are capable of detecting both 125-kHz and ISO 134.2-kHz frequencies.

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