60 Day 100% money back guarantee. This PerkinElmer ViewLux excitation filter was removed from a ViewLux excitation wheel and is marked 480/20EX 2301 BARR#14. The nominal optical specification is a 480 nm center wavelength with a 20 nm bandwidth, corresponding to an approximate 470-490 nm passband. The matching ViewLux catalog designation is filter 480/20, SKU 1430-5050. The optic is supplied in its original black metal mount. It has not been tested or spectrally verified, so transmission, blocking performance, and compliance with original factory specifications are not guaranteed. The supplied photographs show both sides and the complete rim marking. Review the images carefully for surface condition, minor dust, handling marks, and edge wear. Only the single mounted filter shown is included. This component is intended for laboratory fluorescence, microplate imaging, optical instrumentation, or replacement use by qualified personnel. Keyword Block: perkinelmer viewlux, 480/20ex filter, excitation bandpass, barr associates, fluorescence optics, microplate imager, 1430-5050