Check the listing for details. Agilent Technologies N2X N5540A Serial Protocol Tester. Condition: Used, Made in United States. Listed at 1200.00 USD. This Agilent Technologies N2X N5540A Serial Protocol Tester is a powerful tool for analyzing LAN/WAN and protocol data. With its advanced features and high-quality performance, it's the perfect choice for businesses and industries that require accurate and reliable data acquisition. It comes with a custom bundle of components that are specifically designed to ensure optimal functionality. The model number is N5540A and it was manufactured in the United States. This device has not been modified in any way, so you can trust that it will perform exactly as expected.