This is a Agilent E5071C ENA Network Analyzer. This unit is in GREAT condition, and guaranteed fully operational.  The options below are all installed:

485–4-port Test Set, 100 kHz to 8.5 GHz with Bias Tees

1E5–Timebase

Windows 7 OS

The E5071C network analyzer offers the highest RF performance and fastest speed in its class, with a wide frequency range and versatile functions. The E5071C is the ideal solution for manufacturing and R&D engineers evaluating RF components and circuits for frequency range up to 20 GHz.

Features:

• Wide dynamic range: > 123 dB dynamic range at test port (typical)
• Fast measurement speed: 41 ms @ full 2-port cal, 1601 points
• Low trace noise: 0.004 dB rms @ 70 kHz IFBW
• Integrated S-parameter test set
• Port options: 2-port and 4-port
• Balanced measurements (4-port option)
• Frequency options: From 9 kHz – 4.5 GHz/6.5 GHz/8.5 GHz, 100 kHz – 4.5 GHz/6.5 GHz/8.5 GHz (with bias tees), 300 kHz – 14 GHz/20 GHz (with bias tees)
• Built-in Visual Basic for Applications (VBA)