This listing is for one Perkin Elmer Near Infrared Reflectance Accessory NIRA Module. 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 with all accessories pictured. We believe this is for the Frontier FT-IR series of Spectrometers, but may fit other instruments. Please make sure this will work for your system before purchase.