The AF-OS420 is a rugged, low cost LED light source optimized for testing 50 and 62.5 micron multimode applications. It has two LED outputs, a 850nm fixed ST active device mount and a 1300nm fixed ST active device mount for testing insertion loss in a multimode fiber applications. This dual port unit can be used to test Gigabit Ethernet and other multimode LAN systems.

This easy to operate unit features a 3 position slide switch, 850nm - OFF - 1300nm and a low battery indicator.


  • Multimode
  • 850nm & 1300nm LED
  • Low Battery Indicator
  • Side Adjustment Pots for both LED's
  • Compact and Rugged Case
  • Protective Rubber Boot