This rugged, weather and shock resistant MPO VFL for Multimode or Singlemode cable assemblies is a great troubleshooting tool that is needed to establish or confirm polarity, continuity, and macrobends within an MPO optical system. If no breakout cassette is present, the polarity verifier unit (F1-OPV), when used on the far end of a MPO/MTP cable can provide the user a quick, safe and easy determination of continuity and polarity of the fibers within the MPO cable assembly. This new one of a kind product is a must for any pre- and post-installation technician!