We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Compact rectangular USB tester with 2.0 inch colour screen and multiple ports

FNIRSI FNB58 USB Tester PD QC E-Marker 28V 7A

SKU CH-R2ND-WF9KS

Measures voltage, current, power and resistance up to 28 V and 7 A with a 2.0-inch colour display

  • Team affiliation1 Piece
  • Key featuresUSB Tester, Battery Powered, false
  • Overall height3.23 L x 1.65 W x 0.47 H inches
  • Overall width3.23 L x 1.65 W x 0.47 H inches
  • Overall length3.23 L x 1.65 W x 0.47 H inches
  • Product weight0.1 lb (0.05 kg)
  • 0-inch TFT LCD shows live voltage, current and power readings
  • 16-bit ADC plus PD physical chip measures capacity, resistance and D+/D- voltage
  • Triggers QC2.0/3.0, FCP, SCP, AFC, PD2.0/3.0 and VOOC/WARP protocols automatically
  • Records 10 data sets with low-speed 100 sps and high-speed 4 M sps waveform capture
  • Reads E-Marker chip data and cable resistance via differential-pressure method

Compact USB Power Analyser

The FNIRSI FNB58 is a pocket-sized USB tester that measures voltage, current, power, resistance and capacity across USB-A, Micro-USB and Type-C ports. It targets engineers, technicians and hobbyists who need to verify charger output, cable quality or device power draw without a bench supply. The 2.0-inch TFT LCD presents live readings and protocol status in a single handheld unit.

Thermals Noise and Power Draw

The tester draws its operating power from the circuit under test so it adds no separate supply and generates no audible noise. Rated for 28 V and 7 A maximum, it passes through the load current while its 16-bit ADC samples at up to 4 M sps for ripple capture. Onboard temperature measurement lets you log thermal behaviour of the source during extended tests.

Bundled Software and Accessories

A gravity sensor auto-rotates the display for bench or handheld viewing. The package includes no printed manual; instead a QR code links to firmware updates, a digital manual and a companion app for data logging and waveform export. E-Marker chip reading and DASH cable detection are built into the firmware, so cable identification works immediately after a scan.

How it compares

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

Price $64.99
Pricier than about 84% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameFNIRSI
Product typeMultimeters, Tach & Dwell Meters
Size & build
Overall height3.23 L x 1.65 W x 0.47 H inches
Overall width3.23 L x 1.65 W x 0.47 H inches
Overall length3.23 L x 1.65 W x 0.47 H inches
Product weight0.1 lb (0.05 kg)
More details
Team affiliation1 Piece

Questions about this item

How do I install the FNIRSI FNB58 USB tester, and what step is often missed?

Plug the tester between the charger and the device using the integrated USB-A, Micro-USB or Type-C interfaces; the step often missed is scanning the QR code on the packaging to download the manual and any firmware updates, because no printed manual is included.

What maintenance or replacement will the FNIRSI FNB58 need later?

The unit has no user-replaceable battery and no consumable parts; keep the 2.0-inch TFT LCD clean and protect the connectors from debris, and apply firmware updates via the QR-code link when they are released.

What limit appears first during sustained high-power testing on the FNIRSI FNB58?

The 28 V and 7 A maximum ratings are the hard limits; exceeding either voltage or current will stop measurement and can damage the 16-bit ADC and PD protocol chip.

More in Multimeters & Electrical Testers

Similar items