At One Click Purchasing, we are your reliable source for the NSN part 490B manufactured by Electronic Instrumentation Co. We carry a wide range of popular NSN items on our website, including Test Set Cathode Ra like part number 490B which is listed with the NSN 6625010381877 for easy identification. If you are interested in 490B 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.