With 2 Panda PMF connectors (we verified this under fiber connector scope), connector key is aligned to slow axis. With 900um loose-tube fibers. 1-meter fiber. Grade P. New released products, we ordered directly from manufacturer. 

Operating Wavelength Range: ±50 nm 

See 4-sample test data and actual specification at last pdf link below. See general specification at the 1st pdf link below. 

Some samples are in 2pc packing, so you might not get original pack if you only buy 1pc. 

The In-Line Polarizer is designed to pass light with one specific polarization while blocking the other polarization. It can be used to convert unpolarized light into polarized light with high extinction ratio. It can also be used to enhance the extinction ratio of signals with its excellent polarization properties. It is ideal for high speed communication systems and test instrumentations where high polarization extinction ratio is required.