Fluke Networks FiberLert™ Detector

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  • FiberLert Live Fiber Detector
  • FiberLert Detecting Light in Patch Cord
  • FiberLert Checking if a Fiber Optics Port is Live
  • FiberLert Checking if a Transceiver is Working

Key features

  • Detects optical power in SM and MM fiber (850 to 1625 nm)
  • No setup or interpretation – light and sound indicate signal
  • “Non-contact” detector reduces risk of contamination and damage
  • Suitable for ports and patch cords, SM, MM, UPC and APC
  • LightBeat™ feature indicates operation and battery status

Product overview: Fluke Networks FiberLert™ Detector

PTIA 2022 Awards Winner

Quickly check fiber activity, polarity, and connectivity

Just place in front of the fiber end face or port and a light and tone indicate an active fiber (850 nm to 1625 nm) - no setup or interpretation required.

This pocket-sized tool tests:

  • Single-mode
  • Multimode
  • UPC and APC patch cords
  • Ports with a non-contact / non-contaminating detector

The LightBeat™ feature flashes the LED, indicating a powered-on condition and good battery and a timer shuts FiberLert™ Detector off after five minutes of inactivity to extend battery life (2xAAA, included). Rugged design includes a convenient pocket clip and is backed by a two-year warranty.

What's in the box:

  • FiberLert™ Detector
  • Instruction card
  • 2 AAA batteries

Specifications: Fluke Networks FiberLert™ Detector

Operating PrincipleFiberLert is a live fiber detector that senses near infrared light emitted from fiber optic cabling. A continuous red glow at the handle and an audible beeping noise (if not switched off) indicates the presence of near infrared light.
Optical InterfaceNon-contact ceramic ferrule. Fits directly with 1.25 mm LC receptacles. Tethered ferrule adapter for testing 1.25 mm ferrule patch cord. Supports single-mode, multimode, UPC and APC connectors and ports.
Wavelength Detection850 nm to 1625 nm
Optical Power Detection Range+3 dBm to -30 dBm
Light DetectionVisible steady red LED indicator when optical power is detected
Lightbeat™ IndicatorFlashes twice every two seconds when unit is on and battery strength is sufficient.
Battery SaverUnit automatically turns off after five minutes of inactivity
Batteries2 AAA alkaline batteries included
Battery LifeTypically, greater than 1 year (5 hrs. of use a week)
Item Size0.6” x 1.0” x 6.6” / 1.6 x 2.5 x 16.8 cm
Item Weight2.1 oz / 59 g
Operating Temperature Range-10 °C to 50 °C
Operating Humidity Ranges95 % (10 °C to 35 °C)

Non-condensing 75 % (35 °C to 40 °C)

Non-condensing uncontrolled < 10 °C
Operating Altitude≤ 3000 meters
Storage Temeperature-20 °C to 50 °C

Models: Fluke Networks FiberLert™ Detector


FiberLert™ Detector

Buy it


  • FiberLert™ Detector
  • Instruction card
  • 2 AAA batteries
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