The pre-owned Agilent E4404B ESA-E brings reliable 9 kHz–6.7 GHz coverage to service benches and production lines in a single 4-U chassis. Its standard 1 kHz–5 MHz RBWs (expandable to 100 Hz with option 1DR) and –101 dBc/Hz phase-noise floor let engineers separate closely spaced carriers, while the internal pre-amplifier pushes DANL to –167 dBm/Hz—quiet enough to “hear a pin drop” in RF terms. SCPI/IVI control, optional measurement personalities, and LAN/GPIB interfaces keep automation simple.

Buying refurbished cuts capital expense and lead-time; units can ship ISO-17025-calibrated with the latest firmware, preserving Agilent precision and long-term serviceability.

Contact Us for a Fast Quote

Interested in an Agilent E4404B — 6.7 GHz Portable ESA-E Spectrum Analyzer Spectrum Analyzer or a similar model?

• Drop your WhatsApp number or e-mail on our website and we will:

  
  

  • Send a tailored quotation and any current promotions.

  • Provide extra photos, test data, and full configuration details.

  • Discuss shipping, duties, warranty, and any other specifics you need.

  
  

Looking for other models? Our inventory changes daily—ask for the latest list of spectrum analyzers and RF equipment.

Why Choose TESTRO?

1. Laboratory-Verified Performance

   Every unit ships with an ISO/IEC 17025 calibration certificate bearing the TESTRO Certified seal, so you know the specifications are not just claimed—they’re proven.

2. Total Transparency

   High-resolution teardown photos and a live video test session let you inspect seals, modules, and real-time performance metrics before you pay.

3. Real Warranty, Real People

   One-year machine warranty, with our engineering team standing by on business days to provide remote assistance for any software or hardware issues.

4. Global Delivery, Built-In Protection

   DHL lanes—arriving at most destinations in just 3–5 days.

5. Flexible, Modern Payments

   Choose traditional T/T or wire transfer, credit card.

6. Open-Door Assurance

   Visit our Shenzhen facility, walk the refurbishment line, and see your equipment on the bench before it leaves our dock.

Founded in 2017 and headquartered in Shenzhen, TESTRO Electronics LLC focuses on the secondary sale and flexible rental of high-end electronic test instruments. The team counts 30 employees and operates a 1,500 m² warehouse and inspection center in Qianhai, Shenzhen.

Industry Background & Resource Sourcing

Over the past two decades, rapid advances in China’s radio-frequency sector have shortened production-line refresh cycles to roughly 3–5 years. Leveraging long-term partnerships with equipment OEMs, research institutes, and calibration labs, TESTRO acquires traceable, well-maintained decommissioned or replacement units. Every instrument undergoes a five-step technical check and third-party calibration before entering stock, ensuring reliable performance data.

Core Services & Delivery Process