Description This Perkin-Elmer Lambda 900 is a modified UV/VIS/NIR Spectrophotometer with a PELA-1050 custom accessory, 60-mm Ø Spectralon® collection integrating sphere, which replaces the standard detector compartment in the instrument. Since the PMT and PbS detectors are now mounted within a Spectralon integrating sphere, they are insensitive to any movement or slight misalignment of the beam. The advantage in using this PELA-1050 custom accessory is that beam alignment onto the detector optics is no longer critical. The PELA-1050 is useful for measuring samples that spread the beam out slightly, including second-surface mirrors and slightly translucent samples. The PELA-1050 allows for repeatable measurements using the Lambda 900 with PELA-6000 Series VN accessories and other accessories where precise detector alignment may be an issue (such as transmittance compartment devices and variable angle accessory). It is also useful with the biconical reflectance (PELA-1022) accessory and the specular reflectance accessories (PELA-1025, PELA-1026, PELA-1029). The PELA-1050 accessory operates within the 190 nm to 2,500 nm wavelength range, using a combination of PMT and PbS detectors. This is an upgraded PE Lambda-900 UV-VIS-NIR Spectrophotometer that comes with a CORE-2 PC, Windows- 7(10) O/S version UV Winlab software, 90 Days warranty.