The FNIRSI FNAC-28 is a pocket-sized USB power meter that measures voltage, current and power while also triggering fast charging protocols.
This 2-in-1 device lets you test chargers, cables, power banks and USB devices without needing separate equipment.
What Can You Test?
Plug the FNAC-28 between your charger and device.
The screen shows real-time voltage, current and power readings.
You see exactly what your phone, tablet or other device receives during charging.
The quick charge trigger function activates specific voltages from compatible chargers.
Test whether your charger supports QC3.0, VOOC, AFC or other protocols directly.
Measurement Range
Voltage: 4V to 24V – covers standard USB through to USB-C power delivery
Current: 0A to 6.5A bidirectional – handles trickle charging to high-power fast charging
Power: 0W to 156W – tests phone chargers through to laptop adapters
Bidirectional current detection shows power flowing in either direction.
A small arrow on screen indicates current flow direction.
Fast Charging Protocols Supported
The FNAC-28 detects and triggers multiple fast charging standards automatically.
QC2.0 – triggers 5V, 9V, 12V or 20V output
QC3.0 – adjustable voltage from 3.4V to 20V
FCP (Huawei) – triggers 9V, 12V or 20V output
SCP (Huawei SuperCharge) – triggers high-current mode
AFC (Samsung) – triggers 9V or 12V output
VOOC/WARP (OnePlus/Oppo) – triggers 20V output
SVOOC 1.0 and 2.0 – super fast charging testing
Verify charger capabilities or troubleshoot why fast charging isn’t working.
Cable Testing
Poor cables cause slow charging more often than faulty chargers.
The FNAC-28 measures cable internal resistance.
High resistance cables waste power as heat and limit charging speed.
DASH cable detection – verifies OnePlus/Oppo fast charging cable compatibility
Apple 2.4A simulation – checks cables for iPad charging compatibility
Find out if your cables support fast charging or need replacing.
Colour Display with Curves
The 1.06-inch colour TFT LCD shows clear readings at wide viewing angles.
View real-time voltage and current curves to see charging behaviour over time.
Pause waveforms to examine specific moments.
Adjust the time base to zoom in or out on curve displays.
The device stores 5 sets of battery capacity data for comparing charging sessions.
Four Connection Points
USB-A male (input) – connects to standard USB chargers
USB-A female (output) – connects cables or devices with USB-A plugs
Type-C male (input) – connects to USB-C chargers
Type-C female (output) – connects USB-C devices and cables
One tester works with virtually any USB charging setup.
Practical Uses
Test chargers to verify actual output under load.
Evaluate power banks for real capacity versus manufacturer claims.
Check cable quality before purchase or diagnose slow charging.
Monitor phone and tablet charging profiles.
Test third-party laptop chargers for compatibility.
Compact and Light
Dimensions: 73 × 36 × 12mm
Weight: 21g
Fits in your pocket or toolkit easily.
What’s in the Box
- FNIRSI FNAC-28 USB Tester
- USB cable (USB-A to Type-C)
- User manual
Good to Know
The FNAC-28 does not support USB Power Delivery (PD) protocol detection.
For testing USB-PD chargers and laptops, consider the FNIRSI FNB58 which includes full PD support.
Who Is This For?
Anyone who wants to know if their charger and cable deliver what they promise.
Hobbyists testing power setups for projects.
Technicians diagnosing charging problems.
Buyers checking charger and cable quality before use.
Fast UK Delivery
Orders ship from our UK warehouse within 1-2 business days.
No long waits. No customs delays.
60-day returns and 12-month guarantee.
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