---
product_id: 506601492
title: "FNB58 USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)"
brand: "fnirsi"
price: "$173.82"
currency: USD
in_stock: true
reviews_count: 13
category: "Fnirsi"
url: https://www.desertcart.ec/products/506601492-fnb58-usb-tester-pd-qc-usb-c-e-marker-reader
store_origin: EC
region: Ecuador
---

# 28V 7A max voltage/current 2.0-inch TFT LCD display Supports PD/QC fast charge protocols FNB58 USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)

**Brand:** fnirsi
**Price:** $173.82
**Availability:** ✅ In Stock

## Summary

> ⚡ Power-Test Like a Pro — Don’t Get Left Behind in the Fast-Charge Race!

## Quick Answers

- **What is this?** FNB58 USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software) by fnirsi
- **How much does it cost?** $173.82 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/506601492-fnb58-usb-tester-pd-qc-usb-c-e-marker-reader)

## 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

- • **Compact, Rugged & Ready:** Sleek metal housing, lightweight design, and onboard temperature monitoring for professional-grade durability.
- • **Precision Measurement Suite:** 16-bit ADC accuracy with voltage, current, resistance, capacity & ripple waveform analysis at up to 4M sps.
- • **Smart USB-C E-Marker Reader:** Decode cable chip IDs and verify USB-C cable authenticity to avoid costly tech failures.
- • **Crystal-Clear Real-Time Data:** Vivid 2.0-inch TFT display with auto-rotate for instant voltage, current & power insights.
- • **Powerhouse Protocol Compatibility:** Seamlessly triggers and monitors QC2.0/3.0, PD2.0/3.0, VOOC, Super VOOC & more for ultimate fast charge testing.

## Overview

The FNIRSI FNB58 USB Tester is a compact, professional-grade USB voltage and current meter featuring a bright 2.0-inch TFT LCD, support for multiple fast charging protocols (PD/QC/VOOC), and advanced cable chip reading capabilities. It offers precise real-time monitoring of voltage, current, power, resistance, and ripple with high sampling rates, making it an essential tool for tech-savvy professionals and DIY enthusiasts who demand accuracy and control in USB device diagnostics.

## Description

FNIRSI FNB58 USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software): desertcart.com: Tools & Home Improvement

Review: Excellent USB-C cable and charger diagnostic - It's not perfect.. it has bugs, quirks, and inexplicable interactions, but --- once you figure out how to test the things that matter to you, it's very repeatable and clear. Specifically, it can read the Chip ID in USB-C cables, and show all the available power modes in USB-C PD, on a nice color built-in screen. That's nice. You can see the finer details of PD packet exchange as well, but this was less reliable. For testing batteries and other sources, it has a convenient "Trigger" function that can request any voltage or current from your supply, with a nice physical Switch that engages or disengages the "active" part. Switched off, the device is pass-through only and zero risk. Switched ON, you have a lot of direct control over voltage, and of course, risk. You want to put 20v on a USB-A socket? You can! I find the device is best to use when it's plugged into its own independent Micro-USB power source (5v, low current), because then it's not constantly turning off and on with your devices under test. It's easy to crash the device when messing with USB-PD packets, or even have it just beep nonstop until you pull power. The firmware could use some work. Some functions are duplicated or confusing (how many different trigger menus do you need?) but hey, it's affordable for DIY hobby work and comes in a nice well-made housing with an excellent screen for cheap. Unfortunately, the company web site is terrible, hosted on some Mediaflare thing that runs out of bandwidth, so downloading the firmware updates is way more hassle than it should be. They need to up their game, put up a professional site, and host their own files.
Review: High quality, capable and great display - Pros: 1) Nice metal case with easy to use controls 2) Excellent, bright and clear display, with auto-rotate 3) Loads of technical capabilities 4) Nice storage box to keep the unit protected 5) Companion Windows app (NOT macOS) is nicely done, and turns this into a capable testing and measurement device. The only con is the documentation, which is a bit lacking. I had to go to YouTube to learn how to upgrade the firmware (which was necessary because the unit displayed incorrect temperature readings). All in all though, if you're reasonably technically savvy, there won't be any significant issues. Recommended! The manual and firmware are available at the FNIRSI website.

## Features

- 【LCD Display 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 andcurrent detection meter and a mobile communication terminal fast charging trigger with gravity sensor
- 【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】The highest 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 high-speed 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BS2ZS813 |
| Best Sellers Rank | #44,501 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #38 in Voltage Testers |
| Brand | FNIRSI |
| Brand Name | FNIRSI |
| Color | multi-color |
| Compatible Devices | USB devices, mobile phones, mobile power supplies, U disks, chargers |
| Customer Reviews | 4.4 out of 5 stars 185 Reviews |
| Included Components | USB Tester |
| Item Dimensions | 3.23 x 1.65 x 0.47 inches |
| Item Weight | 1.6 ounces |
| Item dimensions L x W x H | 3.23 x 1.65 x 0.47 inches |
| Manufacturer | FNIRSI |
| Measurement Type | Multimeter |
| Minimum Operating Voltage | 4 |
| Model | FNIRSI-FNB58-bp |
| Number of Items | 1 |
| Part Number | FNIRSI-FNB58-bp |
| Power Source | Battery Powered |
| Specification Met | CE, FCC, RoHS, UL |
| Style | FNB58 |
| Style Name | FNB58 |
| Upper Temperature Rating | 125 °C |

## Product Details

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

## Images

![FNB58 USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software) - Image 1](https://m.media-amazon.com/images/I/61r3ahYa0jL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent USB-C cable and charger diagnostic
*by T***O on August 11, 2023*

It's not perfect.. it has bugs, quirks, and inexplicable interactions, but --- once you figure out how to test the things that matter to you, it's very repeatable and clear. Specifically, it can read the Chip ID in USB-C cables, and show all the available power modes in USB-C PD, on a nice color built-in screen. That's nice. You can see the finer details of PD packet exchange as well, but this was less reliable. For testing batteries and other sources, it has a convenient "Trigger" function that can request any voltage or current from your supply, with a nice physical Switch that engages or disengages the "active" part. Switched off, the device is pass-through only and zero risk. Switched ON, you have a lot of direct control over voltage, and of course, risk. You want to put 20v on a USB-A socket? You can! I find the device is best to use when it's plugged into its own independent Micro-USB power source (5v, low current), because then it's not constantly turning off and on with your devices under test. It's easy to crash the device when messing with USB-PD packets, or even have it just beep nonstop until you pull power. The firmware could use some work. Some functions are duplicated or confusing (how many different trigger menus do you need?) but hey, it's affordable for DIY hobby work and comes in a nice well-made housing with an excellent screen for cheap. Unfortunately, the company web site is terrible, hosted on some Mediaflare thing that runs out of bandwidth, so downloading the firmware updates is way more hassle than it should be. They need to up their game, put up a professional site, and host their own files.

### ⭐⭐⭐⭐⭐ High quality, capable and great display
*by B***Y on October 9, 2024*

Pros: 1) Nice metal case with easy to use controls 2) Excellent, bright and clear display, with auto-rotate 3) Loads of technical capabilities 4) Nice storage box to keep the unit protected 5) Companion Windows app (NOT macOS) is nicely done, and turns this into a capable testing and measurement device. The only con is the documentation, which is a bit lacking. I had to go to YouTube to learn how to upgrade the firmware (which was necessary because the unit displayed incorrect temperature readings). All in all though, if you're reasonably technically savvy, there won't be any significant issues. Recommended! The manual and firmware are available at the FNIRSI website.

### ⭐⭐⭐⭐ There's something weird when charging iPhones
*by B***9 on May 26, 2024*

Overall this is a nice tester. Very accurate, lots of features (I like the realtime graph, very interesting to see how the current fluctuates over time). There's one weird problem though. My iPhone 15 Pro max is incapable of requesting 9V from a USB-PD charger when using the tester normally. It only gets 5V, which limits charging power to about 12W. In order to get 9V, you have to enter the PD trigger menu. Then, it can negotiate 9V. You can leave the PD trigger menu after that. The weird thing is, when I used this tester on my laptop, the laptop was able to get 20V without having to do anything special (which is a good thing because it can't charge on anything less). Not sure why the iPhone requires entering the PD trigger menu.

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-08-17*