---
product_id: 497340792
title: "FNIRSI USB Tester 4-28V 7A LCD USB A&C Voltage Current Power Tester Multimeter with App Software, Fast Charge Detection Trigger Capacity Ripple Measurement, PD2.0/PD3.0,QC2.0/QC3.0"
brand: "fnirsi"
price: "€ 102.76"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.fi/products/497340792-fnirsi-usb-tester-4-28v-7a-lcd-usb-a-c
store_origin: FI
region: Finland
---

# Supports PD3.0 & QC3.0 fast charge 16-bit ADC precision App-enabled real-time monitoring FNIRSI USB Tester 4-28V 7A LCD USB A&C Voltage Current Power Tester Multimeter with App Software, Fast Charge Detection Trigger Capacity Ripple Measurement, PD2.0/PD3.0,QC2.0/QC3.0

**Brand:** fnirsi
**Price:** € 102.76
**Availability:** ✅ In Stock

## Summary

> ⚡ Charge smarter, test faster, lead the pack!

## Quick Answers

- **What is this?** FNIRSI USB Tester 4-28V 7A LCD USB A&C Voltage Current Power Tester Multimeter with App Software, Fast Charge Detection Trigger Capacity Ripple Measurement, PD2.0/PD3.0,QC2.0/QC3.0 by fnirsi
- **How much does it cost?** € 102.76 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/497340792-fnirsi-usb-tester-4-28v-7a-lcd-usb-a-c)

## Best For

- fnirsi enthusiasts

## Why This Product

- Trusted fnirsi brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smart & Portable:** Gravity sensor-enabled TFT LCD display pairs with intuitive app software for on-the-go, real-time device analysis.
- • **Data-Driven Insights:** Record and visualize voltage, current, ripple, and capacity with up to 4M sps sampling rate for professional-grade diagnostics.
- • **Fast Charge Protocol Mastery:** Automatically detects and triggers QC2.0/3.0, PD2.0/3.0, VOOC, and more for seamless fast charging validation.
- • **Precision at Your Fingertips:** 16-bit ADC and physical PD chip deliver ultra-accurate voltage, current, and power readings.
- • **Universal Multi-Port Compatibility:** Integrated USB-A, Micro-USB, and Type-C interfaces cover all your device testing needs.

## Overview

The FNIRSIUSB Tester FNB58 is a professional-grade USB voltage and current multimeter featuring a 2.0-inch TFT LCD, 16-bit ADC precision, and multi-port support (USB-A, Micro-USB, Type-C). It supports advanced fast charge protocols including PD2.0/3.0 and QC2.0/3.0, with real-time monitoring via dedicated app software. Designed for tech-savvy professionals, it offers detailed ripple measurement, capacity tracking, and cable resistance testing, making it an essential tool for accurate USB power diagnostics and fast charge validation.

## Description

FNIRSI USB Tester 4-28V 7A LCD USB A&C Voltage Current Power Tester Multimeter with App Software, Fast Charge Detection Trigger Capacity Ripple Measurement, PD2.0/PD3.0,QC2.0/QC3.0

## Features

- 【Multi-port USB tester】FNIRSI FNB58 has a 2.0-inch TFT LCD display, integrated USB-A, Micro-USB, Type-C interface. It is a USB voltage and current detection meter with APP software, a mobile communication terminal with gravity sensor and a fast charging trigger
- 【Multifunction USB Digital Tester】FNB58 uses external 16-bit ADC, PD protocol physical chip. FNB58 USB tester can monitor the voltage, current, power, resistance, capacity, D+/D- voltage etc, it can be used to test the fast charging protocol of chargers
- 【Fast Charge Protocol Trigger Detection】FNB58 supports QC2.0/QC3.0, FCP/SCP, AFC, PD2.0/3.0, VOOC/WARP, Super VOOC 1.0/2.0 trigger. The above protocols all support automatic monitoring. MTK-PE automatic detection. Support QC2.O->PD2.0 protocol conversion
- 【Parameter Recording】 Six-digit display of voltage, current and power. 10 sets of switchable capacity, power etc. Support low-speed waveform drawing, 2 sps-100 sps sampling rate. Support ripple drawing, up to 4 M sps sampling rate
- 【USB tester detection function】The resistance measurement of the wire by the differential pressure method. E-Marker Cable chip reading. DASH Cable data reading. Record of startup time. Onboard temperature measurement. PD monitor. Analog DASH cable
- 【Note】To support environmental protection and reduce paper use, the FNB58 does not include a printed manual. You can access the manual, firmware updates, and app information via the QR code provided in the packaging
- Ensure the PD function switch is on, select the correct input port, and use a compatible protocol; if incompatible, the device defaults to 5 V output, which may limit power measurement

## Product Details

- **Brand:** FNIRSI
- **Power Source:** Battery Powered
- **Style:** FNB58
- **Color:** multi-color
- **Item Weight:** 1.6 ounces

## Images

![FNIRSI USB Tester 4-28V 7A LCD USB A&C Voltage Current Power Tester Multimeter with App Software, Fast Charge Detection Trigger Capacity Ripple Measurement, PD2.0/PD3.0,QC2.0/QC3.0 - Image 1](https://m.media-amazon.com/images/I/71VDjC5CdjL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ ✅ Accurate, compact, efficient and sufficient
*by A***. on February 29, 2024*

I am providing an overall comment for three USB testers, all of which deserve to be purchased as they complement each other perfectly and are consistent in their results.I would like to dedicate the majority of this review to the Bit Trade One model, which has recently arrived on Amazon. It deserves a shoutout because the tool is exceptional and inexpensive for what it offers.The ADUSBCIM is a USB cable tester that truly complements traditional USB cable testers. Only the cable to be tested needs to be plugged into the A and B ports, and the tool does the rest.The reference value for calculating the cable's resistance is taken using a CR2032 battery, and I note that the calculation is very precise and stable.You can find on Bit Trade One's ADUSBCIM GitHub page, in the Pull Request section, a manual in English in PDF format. This is my small contribution to the project, as the current official English manual is more of a word-by-word description that is difficult to understand.Thanks to this tester, I discovered, for example, that Anker cables, the 765 series, were actually poor high-resistance cables, and that I had much better options for charging. I ended up wasting money on cables that turned out to be slower than cables that were given to me for free with computer accessories.The FNIRSI FNB58 is a very comprehensive USB-A and USB-C port tester. It notably offers numerous rapid charging protocol tests, can test the quality and resistance of a cable, and obtain oscilloscope-like graphical representations. Now that we are on PD3.0 and with PD3.1 approaching quickly, owning one of these tools is now essential to validate the proper functioning of an installation.I've read a lot of advice on Reddit, and if you're looking to equip yourself with the best products offering the most testing possibilities, here are the tester references to get:- Bit Trade One ADUSBCIM (very thorough cable tester testing all the lines of a cable)- FNIRSI FNB58 (the most comprehensive, many ports, many scenarios, USBA/C Micro)- ChargerLab KM003C (the most modern, TB4, 250W)If you have these three or at least a combination of the cable and usb tester, it will take you no more than a few days to become a USB expert. 👌

### ⭐⭐⭐⭐⭐ Good usb tester with PD trigger capability
*by C***G on April 24, 2025*

I’ve been impressed with the FNIRSI USB tester’s build quality. Unlike many testers on the market, which often resemble beta models with open sides or no casing, the FNIRSI is encased in a professional housing with input ports for USB-C, Micro USB, and USB-A.I’ve used the USB-C eMarker check to test cables, which works well. The tester is supposedly capable of measuring cable resistance, but I haven’t figured out how to do this yet. Instead, I purchased a Treedix cable tester, which is battery-powered and can measure resistance. Treedix also includes a Lightning port for testing Apple cables.I’ve tested several battery banks to verify if they deliver the power promised in their advertising. The included instructions were minimal, but I found documentation on the FNIRSI website. Initially, I struggled to trigger higher Power Delivery (PD) voltages (beyond the standard 5V) on the USB load meter. Watching YouTube videos helped me navigate the PD trigger menu effectively.A firmware update is available on the FNIRSI website, but I haven’t applied it yet, as the accompanying app seems unreliable. I plan to test it on a sandboxed PC to ensure safety.I liked the tester so much that I bought a second unit. This allows me to use the PD trigger to test the load on multiple ports of a power bank simultaneously.I’m still learning how to fully utilize the tester, particularly the PC logging feature, which I hope to explore further.

### ⭐⭐⭐⭐ Great item, need better manual
*by T***E on August 19, 2025*

I like this device a lot, but the lack of a great manual caused me to downgrade one star. Works for what i need.

## Frequently Bought Together

- FNIRSI USB Tester 4-28V 7A LCD USB A&C Voltage Current Power Tester Multimeter with App Software, Fast Charge Detection Trigger Capacity Ripple Measurement, PD2.0/PD3.0,QC2.0/QC3.0
- Treedix USB Cable Tester Board USB Cable Checker Data Wire with Acrylic Case Charging Test Data Line Type-C Micro Type A Type B
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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-01-27*