1m -0/+0.1m long, Master reference patchcord, 3 mm OD jacketed (blue color), 5/125µm 780nm PM fiber patchcord, terminated on one end with a super FC/PC connector with +/-1.5degree polarization angle tolerance (Optically) and while there is no external stress is applied onto fiber, with an E2000/PC connector on the other end. Both connector keys are pre-aligned and locked on the slow axis. ER=30dB minimum.