At One Click Purchasing, we are your reliable source for the NSN part 663940 manufactured by Beckman Coulter Inc. We carry a wide range of popular NSN items on our website, including Calibrator Diagnost like part number 663940 which is listed with the NSN 6550014332475 for easy identification. If you are interested in 663940 item, then take the advantage of our online RFQ service, or peruse our website as you see fit to find other items of interest that you may wish to learn more about.