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Compact USB tester with 2.0 inch TFT LCD display and integrated USB-A, Micro-USB, Type-C ports

FNIRSI FNB58 USB Tester 4-28V 7A LCD Multimeter

SKU CH-KC58-CCQ7Z

Measures voltage, current, power and capacity on USB-A, Micro-USB and Type-C ports with a 2.0-inch TFT LCD and app software

  • Team affiliation1 Piece
  • Key featuresUSB Tester, Ul, Iec, Battery Powered, false
  • Product weight0.1 lb (0.05 kg)
  • Product typeVoltage, Current, Fast Charge Detection, Etc
  • 0-inch TFT LCD shows voltage, current, power at a glance
  • 16-bit ADC with PD protocol chip measures capacity, resistance, D+/D- voltage
  • Triggers QC2.0, QC3.0, FCP, SCP, AFC, PD2.0, PD3.0, VOOC, Super VOOC automatically
  • Records 10 data sets, draws ripple waveforms up to 4 M samples per second
  • Reads E-Marker chips, measures cable resistance, logs startup time and onboard temperature

USB Tester 4-28V 7A

The FNIRSI FNB58 is a compact USB multimeter that measures voltage, current, power, resistance and capacity on USB-A, Micro-USB and Type-C ports. A 2.0-inch TFT LCD shows six-digit readings while an external 16-bit ADC and PD protocol chip handle fast-charge protocol detection. It connects to a mobile app for data logging and waveform capture.

Engineers and hobbyists debugging chargers

Technicians who need to verify QC2.0, QC3.0, FCP, SCP, AFC, PD2.0, PD3.0, VOOC, WARP or Super VOOC trigger behaviour will find the automatic monitoring and protocol conversion useful. Builders requiring wireless connectivity, higher voltage ranges or built-in load banks should consider other instruments.

Measures up to 28 volts and 7 amps

The tester comfortably handles standard USB power delivery up to 28 V and 7 A, recording ten capacity banks and sampling ripple at up to 4 M samples per second. It does not support voltages above 28 V or currents beyond 7 A, so high-power industrial supplies fall outside its range.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $69.99
Pricier than about 87% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameFNIRSI
Product typeVoltage, Current, Fast Charge Detection, Etc
Size & build
Product weight0.1 lb (0.05 kg)
More details
Team affiliation1 Piece

Questions about this item

Which USB-A or USB-C charger or power bank must I already have to supply the 4-28V 7A input this tester measures?

Any charger or power bank with a USB-A or USB-C output that can deliver within the 4-28V range and up to 7A will power the FNB58 for testing.

Will the FNB58 still show voltage and current if I connect an older 5V-only USB-A charger?

Yes, the 4-28V range covers 5V, so the LCD will display voltage, current and power from a legacy 5V charger.

How do I confirm the FNB58 is recording capacity and ripple correctly after I plug it in?

Watch the 2.0-inch TFT for live capacity counts and the low-speed waveform at 2-100 sps or the ripple plot at up to 4 M sps to verify logging is active.

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