This listing is for one Perkin Elmer Near Infrared Reflectance Accessory NIRA Module for Spectrum One FTIR Spectrometer. Set appears to be new or very slightly used, in original box. May have been a demo unit. Comes in the original Perkin Elmer box. We believe this is for the Spectrum One FT-IR, but may fit other Spectrum series instruments. Please make sure this will work for your system before purchase.