---
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: "AR$197688"
currency: ARS
in_stock: true
reviews_count: 9
category: "Fnirsi"
url: https://www.desertcart.com.ar/products/497340792-fnirsi-usb-tester-4-28v-7a-lcd-usb-a-c
store_origin: AR
region: Argentina
---

# Supports fast charge protocols QC, PD, VOOC, SuperVOOC 16-bit ADC & 4M sps sampling for precise measurements Multi-port USB interfaces (USB-A, Micro-USB, Type-C) 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:** AR$197688
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your USB IQ — test smarter, charge faster!

## 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?** AR$197688 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/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

- • **All-in-One USB Power Detective:** Seamlessly monitor voltage, current, power, resistance, and capacity across USB-A, Micro-USB, and Type-C ports.
- • **Precision Data & Ripple Analysis:** Leverages a 16-bit ADC and up to 4 million samples per second for oscilloscope-level ripple and waveform insights.
- • **Cable Quality & Resistance Testing:** Advanced differential pressure method and E-Marker chip reading to expose hidden cable inefficiencies and ensure optimal charging.
- • **Smart App Integration & Data Logging:** Sync with dedicated app software for real-time monitoring, 10 profile saves, and detailed parameter recording.
- • **Pro-Grade Fast Charge Protocol Trigger:** Automatically detects and triggers QC2.0/3.0, PD2.0/3.0, VOOC, and more for cutting-edge charging validation.

## Overview

The FNIRSI FNB58 USB Tester is a professional-grade, multi-port device designed for tech-savvy professionals to accurately measure USB voltage, current, power, and cable quality. Featuring a crisp 2.0-inch TFT LCD, 16-bit ADC precision, and support for all major fast charging protocols including QC, PD, and VOOC, it empowers users to validate chargers and cables with oscilloscope-level detail. Integrated app connectivity and advanced data logging make it an essential tool for anyone serious about optimizing their charging ecosystem.

## 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: desertcart.com: Tools & Home Improvement

Review: ✅ Accurate, compact, efficient and sufficient - 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 desertcart. 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. 👌
Review: Awesome meter with great features! - Good quality USB meter which allows USB data passthrough, the readings look accurate when compared to the measurements from my 737 power bank. It is simple to navigate, and can also test battery capacity which is very useful and it also allows you to set the battery voltage and estimated charging efficiency with 10 profile save slots available. I recommend keeping the device plugged in with the top left micro USB port to stop the unexpected power offs while testing, and for when you want to keep the toggle switch "pd com" as off which will bypass the fnb58 handshake with the charger and instead allows USB C negotiation directly between the phone and charging brick.

## 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. 👌

### ⭐⭐⭐⭐⭐ Awesome meter with great features!
*by E***P on October 19, 2025*

Good quality USB meter which allows USB data passthrough, the readings look accurate when compared to the measurements from my 737 power bank. It is simple to navigate, and can also test battery capacity which is very useful and it also allows you to set the battery voltage and estimated charging efficiency with 10 profile save slots available. I recommend keeping the device plugged in with the top left micro USB port to stop the unexpected power offs while testing, and for when you want to keep the toggle switch "pd com" as off which will bypass the fnb58 handshake with the charger and instead allows USB C negotiation directly between the phone and charging brick.

### ⭐⭐⭐⭐ No serial comms
*by R***L on January 18, 2026*

Did what I wanted. Checked the power draw on some devices I'm developing. However, it did not allow me to communicate with devices plugged into it. For example I'm trying to see what the power needs are for a small device and I need terminal access to tell the device to change states (turn off BT). Not happening. No comms of any type. So, a handy device no doubt but not suitable for my needs. If you need serial comms, it's not going to work. It will, however, see a USB drive.

## Frequently Bought Together

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-01-30*