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PIT tags

1.4 x 8.5 mm FDX-B PIT Tag

The 1.4 x 8.5 mm FDX-B PIT tag is the smaller option in UID's fish and wildlife lineup, with less volume than the standard 2.1 x 12 mm tag. Encapsulated in biocompatible glass, it carries a unique 128-bit ID and scans reliably with UID ISO readers. Designed for fish, amphibians, and small mammals where a 12 mm tag is too large.

  • 1.4 x 8.5 mm
  • ISO 11784/11785
  • ICAR certified
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FDX-B PIT tag with 1.4 x 8.5 mm dimensions
FDX-B PIT tag with 1.4 x 8.5 mm dimensions
Size at scale

A Small Tag for Small Species

At 1.4 mm in diameter and 8.5 mm long, this tag allows implantation in species that have historically been too small to mark individually — juvenile salmonids, small-bodied amphibians, shrews, lizards. The tag has less volume than the standard 2.1 x 12 mm tag.

The biocompatible glass capsule and passive design keep the implant profile low and the animal's welfare impact minimal. No battery. No maintenance. The ID persists for the life of the animal.

Specifications

Protocol
FDX-B
Frequency
Low Frequency
Identifier
128-bit unique ID
Mode
Read-only
Dimensions
1.4 x 8.5 mm (D x L)
Weight
0.027 g
Material
Biocompatible glass encapsulation
Operating Temperature
−25 °C to 85 °C
Storage Temperature
−40 °C to 85 °C
Shock & Vibration
Conforms to IEC 68-2-6/29
Standards
ISO 11784/11785
Certification
ICAR certified
Works with

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Common Questions

  • When should I use the 1.4 x 8.5 mm tag instead of the 2.1 x 12 mm?

    Use the 1.4 x 8.5 mm when body mass or implant site is the limiting factor — juvenile fish, small amphibians, or any species where a 12 mm tag would compromise survival or retention.

  • Which reader works with the 1.4 x 8.5 mm FDX-B tag?

    Tags are compatible with all UID ISO readers.

  • How are the tags shipped?

    Tags are shipped in injection-ready cartridges, individually packaged and sterile. Contact us to confirm packaging format for your order volume, as bulk configurations may differ.

Not sure which size is right for your study?

Call us. We can help you choose the tags that are right for your work.

Get in Touch Compare with 2.1 x 12 mm