Skip to main content
SEESII Upgraded NanoVNA-H4 Vector Network Analyzer, Latest V4.4 9KHz-1.5GHz HF VHF UHF 4" Touch Screen VNA Antenna Analyzer Measures S Parameters,Voltage Standing Wave Ratio, Phase,Delay, Smith Chart
Seesii

SEESII Upgraded NanoVNA-H4 Vector Network Analyzer

Bottom line: The SEESII Upgraded NanoVNA-H4 Vector Network Analyzer ($76.49 on Amazon as of 2026-10-06): Wide 9KHz-1.5GHz sweep covers HF, VHF, and UHF antennas on one instrument; main trade-off: microSD card not included despite the built-in card slot.

$76.49

As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →

Buy on Amazon — $76.49 Compare to similar power supplies & cables

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Wide 9KHz-1.5GHz sweep covers HF, VHF, and UHF antennas on one instrument
  • ✓ 4-inch LCD touchscreen with stylus, larger than the 2.8-inch NanoVNA-H
  • ✓ Better than 70dB dynamic range across the 50KHz-300MHz si5351 direct band
  • ✓ MicroSD slot saves field sweeps and screenshots to cards up to 32GB
  • ✓ 1950mAh battery plus OPEN/SHORT/LOAD standards and two RG316 cables included

Cons

  • ✗ MicroSD card not included despite the built-in card slot
  • ✗ Dynamic range drops to 40dB above 900MHz on the harmonic extension
  • ✗ S21 measurement needs manual transceiver port rewiring, not a menu toggle
  • ✗ Touchstone export requires installing NanoVNASaver on a separate PC

Manufacturer description

The SEESII Upgraded NanoVNA-H4 puts a full vector network analyzer in your hand for antenna work, sweeping 9KHz to 1.5GHz across HF, VHF, and UHF. Built on Hugen's V4.4 hardware with a 4-inch LCD touchscreen, it reads S11 and S21 parameters, SWR, phase, delay, and plots them on a Smith chart so you can see exactly where an antenna resonates instead of guessing. Dynamic range tracks the si5351 output: better than 70dB from 50KHz to 300MHz, better than 60dB from 300MHz to 900MHz, and better than 40dB in the harmonic-extended 900MHz to 1.5GHz band. A MicroSD slot takes cards up to 32GB for…

Related Products

Other products in this category you may like:

SpecPicks Verdict

SpecPicks scored SEESII Upgraded NanoVNA-H4 Vector Network Analyzer using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies & cables category. Seesii's power supplies & cables lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for power supplies & cables of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

What frequency range does the NanoVNA-H4 cover?

It measures from 9KHz to 1.5GHz. The si5351 direct output handles 50KHz to 300MHz, with harmonic extension carrying the sweep through 900MHz and up to 1.5GHz.

Is the dynamic range the same across the whole band?

No. Seesii specifies better than 70dB from 50KHz to 300MHz, better than 60dB from 300MHz to 900MHz, and better than 40dB from 900MHz to 1.5GHz.

What comes in the box?

The NanoVNA-H4 with a 1950mAh battery, a USB Type-C cable, two 15cm SMA male-to-male RG316 cables, OPEN, SHORT, and LOAD calibration standards, and a touchscreen stylus.

Can I save measurements and pull them into PC software?

Yes. A built-in MicroSD slot takes cards up to 32GB (card not included), and NanoVNASaver over USB exports Touchstone .snp files for RF design and simulation tools.

Can it measure S21 as well as S11?

Yes, the TX/RX method captures complete S11 and S21 parameters, though you manually swap the transceiver port wiring to switch between them.

Key Features

  • UPGRADED NANOVNA ANALYZER: SeeSii Nanovna-h4 Vector Network Analyzer is developed by Hugen. With the latest 4.4 version,9KHz-1.5GHz measure range,4.0 inch LCD touchscreen, mini and portable design. This Antenna Analyzer is provides outstanding vector network measurement capabilities and perfect for evaluating antenna resonance and SWR. It is a very handy & smart analyzer for electronics engineers, amateur radio operators, or radio diy amateurs
  • BUILT-IN MICRO-SD PORT & TIME DISPLAY: The latest antenna analyzer with a MicroSD card port, so you can save field test data or screens to a MicroSD card at any time, supporting up to 32GB memory card. (Not included in the package).In addition, different from the old version of NanoVNAs, the date and time can be customized, which is convenient for you to further record and save data. The default firmware main function is used for antenna performance measurement
  • IMPROVED FREQUENCY ALGORITHM: The Vector Network Analyzer can use the old harmonic extension of si5351 to support the measurement frequency up to 1.5GHz. The 50K-300MHz frequency range of the si5351 direct output provides better than 70dB of dynamics, The extended 300M-900MHz band provides better than 60dB of dynamics, and the 900M-1.5GHz band is better than 40dB of dynamics. Great for troubleshooting antennas and improving performance
  • PC CONNECTION & TX/RX FUNCTION: The VNA analyzer uses PC software NanoVNASaver, it can connect to a NanoVNA and extracts the data for display on a computer for saving to Touchstone files. We can export Touchstone (snp) files for various radio design and simulation software through PC software. In addition, the default firmware is mainly used for antenna performance measurement. The TX/RX method can measure the complete S11/S21 parameters (need to manually replace the transceiver port wiring)
  • Abundant Accessories: Equipped with 1x NanoVNA-H4(with 1950mA-h battery), 1x USB Type-C cable, 2 x 15cm SMA male to male RG316 RF cable, 1x SMA male calibration kit - OPEN,1x SMA male calibration kit - SHORT,1 x SMA male calibration kit - LOAD,1 x Touchscreen pen. It's very useful as an antenna analyzer for your ham station, easy to set without fancy calibration
  • Reliable After-Sales Service:We provide professional technical support to keep you away from after-sales worries. If you are not satisfied with SeeSii Nanovna Vector Analyzer or have any other questions, please feel free to contact us. Our after-sales service experts will reply to your information as soon as possible, We will do our best to solve your problems, and you can purchase and experience with confidence

Full Specifications

BrandSeesii
ColorNanovna H4
AntennaRadio
Impedance50 Ohms
Unit Count1.0 Count
ConnectivityUSB
Model NumberNanoVNA-H4
CompatibilityPC
Maximum Range10 Feet
Built-In MediaNanovna-H4 Kit
Mfr Part NumberB085CFHTBM
Number of Items1
Number of Packs1
AntennaDescriptionRadio
Item Dimensions L x W x H2.95"L x 2.95"W x 0.71"H
Full listing titleSEESII Upgraded NanoVNA-H4 Vector Network Analyzer, Latest V4.4 9KHz-1.5GHz HF VHF UHF 4" Touch Screen VNA Antenna Analyzer Measures S Parameters,Voltage Standing Wave Ratio, Phase,Delay, Smith Chart

Ready to buy?

SEESII Upgraded NanoVNA-H4 Vector Network Analyzer, Latest V4.4 9KHz-1.5GHz HF VHF UHF 4" Touch Screen VNA Antenna Analyzer Measures S Parameters,Voltage Standing Wave Ratio, Phase,Delay, Smith Chart is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $76.49

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Related Power Supplies & Cables

Keep exploring SpecPicks

Other buying guides

Browse the catalog

Editorial

More guides & deep dives from the SpecPicks archive

Browse all articles & guides →

More reviews from the SpecPicks archive

Browse all reviews →

Earliest SpecPicks reviews

Browse full archive →
SEESII Upgraded NanoVNA-H4 Vector Network Analyzer, Latest V4.4 9KHz-1.5GHz HF VHF UHF 4" Touch Screen VNA Antenna Analyzer Measures S Parameters,Voltage Standing Wave Ratio, Phase,Delay, Smith Chart
$76.49
View on Amazon →