The Keysight N5230A-240 4-Port Microwave Network Analyzer, 300kHz-20GHz is a member of the PNA series network analyzer platform and is designed for your general-purpose network analysis needs. Advanced features help you work quickly, easily, and accurately. With the same firmware as the PNA, the PNA-L offers the perfect balance of value and performance. PNA-L provides efficiency and flexibility in both manufacuring and R&D applications for industries from wireless LAN components to aerospace and defense. Option 240 is a custom option that takes this unit down to 300Khz (standard 20gig model starts at 10Mhz. This custom option spec also turns this analyzer from a 2 port to a 4 port. Has USB. Also uses Ecal kits.