Choosing between a pocket-size new analyzer and a full-size used one starts with a simple question: will you carry the instrument to the work, or will the work come to the instrument? The two units take opposite approaches-one is built around a fresh, battery-powered design, the other around bench-grade measurement specifications in a used condition.
Quick verdict
If a new, battery-powered analyzer for quick RF checks is your priority, the TinySA Ultra+ ZS407 is the practical choice. If you need the sensitivity and bandwidth controls of an Agilent instrument and can handle an out-of-calibration unit sold without accessories, the N9320B is the bench-oriented choice.
Comparison at a glance
| Aspect | TinySA Ultra+ ZS407 | Agilent N9320B |
| Listed price | USD 199.00 | USD 1,200.00 |
| Condition | New | Used |
| Brand | Seesii | Agilent |
Where each wins
TinySA Ultra+ ZS407 - The only new unit of the two, and the one with a 5000mAh rechargeable battery, so it is ready for portable work. The title also gives it an RF signal generator, which adds flexibility for drive-level tests and alignment checks.
Agilent N9320B - The stated 9kHz-3GHz coverage and -130 dBm displayed average noise level put it in a different measurement class. The 10Hz-1MHz resolution and video bandwidth ranges give you finer control over what you are looking at.
Product notes
TinySA Ultra+ ZS407
At USD 199, the TinySA Ultra+ ZS407 is the lower-priced option and the only one listed as new. It runs on a 5000mAh rechargeable battery, so it is easy to take to a job site, and the title includes an RF signal generator. The built-in LNA and attenuator give a stated working range of -115dBm to -19dBm, a useful window for many RF checks. The 4-inch display and the 32GB listed in the title point to a self-contained design. The catch is the frequency span: the title says 10kHz-1.5GHz, while the specifications say 100kHz-7.3GHz. Because those two numbers do not line up, treat the actual coverage as unconfirmed before planning measurements around it.
Agilent N9320B
At USD 1,200, the Agilent N9320B is the costlier unit and the only one listed as used. It is described as powering on and functioning, but it is out of calibration, sold as-is, and comes without accessories or a power cable. What you get in return is a 9kHz-3GHz range, a displayed average noise level of -130 dBm, and resolution and video bandwidth ranges from 10Hz to 1MHz. The description points it at RF testing, troubleshooting, education, and laboratory use, which matches the bench-style format. Those are the specifications that matter for more demanding RF work, provided you are comfortable with the calibration condition.
Final choice by use case
There is no overall winner because the trade-off is condition and portability versus measurement depth. If you need to confirm a signal in the field, the TinySA Ultra+ ZS407's new condition, built-in battery, and signal generator make it the lower-friction option. If you are chasing low-level signals in a lab, the Agilent N9320B's sensitivity and bandwidth controls are worth the used-condition risk. For a quick go-bag test tool, pick the TinySA; for a dedicated bench role, pick the Agilent.
