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Compact USB tester with 1.77 inch colour LCD screen and CNC metal shell

FNIRSI FNB48P USB Tester 4-24V 6.5A 1.77in LCD Multimeter with App

SKU CH-GRP3-RGWDR

Measures voltage, current, power, resistance, capacity and temperature on USB-A, Micro-USB and Type-C ports from 4 to 24 V at up to 6.5 A

  • Team affiliation1 Piece
  • Key featuresUSB Tester, CE, Corded Electric, false
  • Product weight0.1 lb (0.05 kg)
  • Product typeMultimeters, Tach & Dwell Meters
  • 77-inch colour TFT LCD with wide viewing angle and auto-rotate
  • Measures volts, amps, watts, resistance, capacity, temperature and D+/D- voltage
  • Triggers and detects QC 2.0/3.0, FCP, SCP, AFC, PD 2.0/3.0, VOOC, WARP and Super VOOC protocols
  • 16-bit ADC gives 0.00001 resolution on voltage, current and power readings
  • Records 10 data sets plus voltage-current curves and supports 3.2 M samples per second ripple capture

USB tester for charger diagnostics

The FNIRSI FNB48P is a compact multimeter built to analyse USB power delivery. It integrates USB-A, Micro-USB and Type-C ports so technicians and enthusiasts can verify charger output, cable quality and device draw in a single tool.

Thermal noise and power envelope

The aluminium CNC shell acts as a passive heatsink while the unit measures up to 24 V and 6.5 A. With no active cooling the tester runs silently and draws only the tiny current needed for its 1.77-inch colour display and onboard electronics.

Sustained-load behaviour

A 16-bit ADC samples at up to 3.2 M sps for ripple capture and 100 sps for waveform logging, letting the instrument record voltage, current, power, resistance and temperature continuously. Ten switchable data sets store capacity, energy and time statistics without gaps during long sessions.

How it compares

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

Price $55.99
Pricier than about 79% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameFNIRSI
Product typeMultimeters, Tach & Dwell Meters
Size & build
Product weight0.1 lb (0.05 kg)
More details
Team affiliation1 Piece

Questions about this item

How do I install the FNIRSI FNB48P and which connection step is often missed?

Connect the tester between the power source and the device using the integrated USB-A, Micro-USB or Type-C interface; the step users miss is selecting the correct fast-charge protocol trigger (QC2.0/QC3.0, FCP/SCP, AFC, PD2.0/3.0, VOOC/WARP, Super VOOC 1.0/2.0) in the app so the charger negotiates the target voltage.

What maintenance or replacement will the FNIRSI FNB48P need later?

The unit has no user-replaceable battery or sensor; keep the CNC metal shell clean, protect the 1.77-inch TFT LCD from scratches, and verify calibration occasionally by measuring a known 4-24 V, 6.5 A source — no scheduled parts replacement is required.

What limit appears first during sustained high-power testing on the FNIRSI FNB48P?

The 6.5 A current ceiling is reached before the 24 V voltage limit; the onboard temperature sensor will also rise, so monitor the displayed temperature and pause if it approaches the device's safe operating range.

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