Special Order Details Available for Backorder
Part Number: 257MT UPC: 783310605362 Weight: 1.25


  • Test insertion loss of multi-mode MT-RJ fiber optic cables and connectors, or pair with an optical power meter for link loss testing of installed cable plants.
  • Stable, calibrated output.
  • Proven, reliable and compact design.
  • Easy-to-use; two buttons control all essential functions.
  • Rubber boot protects against dropping and crushing.
  • Rugged and splash proof.
  • 257MT model has an 850nm wavelength.
  • Nominal output for 62.5/125 is -20dBm for both 850nm and 1300.
  • Continuous and alternating output modes.
  • Fixed MT-RJ interface.
  • User selectable auto shutoff.
  • Two AA batteries provide power for over 24 hours.
  • Optional AC power converter/adapter is available for prolonged or bench top use.

  • Source Type: LED
  • Wavelength (nm): 850
  • Optical Interface Type: Fixed MT-RJ
  • Output Modes: Continuous and Modulated
  • Modes: Multi-Mode (Glass)

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