---
product_id: 506601492
title: "USB Tester 4-28V 7A LCD USB A&C Voltage Current Power Tester Multimeter, Fast Charge Detection Trigger Capacity Ripple Measurement, PD2.0/PD3.0,QC2.0/QC3.0"
brand: "fnirsi"
price: "€ 99.87"
currency: EUR
in_stock: true
reviews_count: 12
category: "Fnirsi"
url: https://www.desertcart.nl/products/506601492-usb-tester-4-28v-7a-lcd-usb-a-and-c
store_origin: NL
region: Netherlands
---

# 7A max current detection 16-bit ADC precision Capacity & ripple measurement USB Tester 4-28V 7A LCD USB A&C Voltage Current Power Tester Multimeter, Fast Charge Detection Trigger Capacity Ripple Measurement, PD2.0/PD3.0,QC2.0/QC3.0

**Brand:** fnirsi
**Price:** € 99.87
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your diagnostics with precision and style!

## Quick Answers

- **What is this?** USB Tester 4-28V 7A LCD USB A&C Voltage Current Power Tester Multimeter, Fast Charge Detection Trigger Capacity Ripple Measurement, PD2.0/PD3.0,QC2.0/QC3.0 by fnirsi
- **How much does it cost?** € 99.87 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/506601492-usb-tester-4-28v-7a-lcd-usb-a-and-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

- • **Dynamic LCD Display:** 2.0-inch TFT color screen with auto-rotate and gravity sensor ensures crystal-clear, real-time data visualization anywhere.
- • **Compact & Durable Design:** Sleek metal case with intuitive controls and a protective storage box—built for the tech-savvy professional on the go.
- • **Precision Power Insights:** 16-bit ADC and PD protocol chip deliver ultra-accurate voltage, current, and power readings for pro-grade diagnostics.
- • **Advanced Cable & Ripple Analysis:** Reads E-Marker and DASH cable chips, measures ripple up to 4Msps, and tracks resistance via differential pressure method.
- • **Universal Fast-Charge Compatibility:** Supports all major fast charge protocols including QC2.0/3.0, PD2.0/3.0, VOOC, and Super VOOC for seamless device testing.

## Overview

The FNIRSI FNB58 USB Tester is a compact, high-precision multimeter designed for professionals and enthusiasts to monitor USB voltage, current, power, and fast charge protocols. Featuring a vivid 2-inch TFT LCD, it supports major fast charging standards (QC, PD, VOOC), advanced cable chip reading, and ripple measurement up to 4 million samples per second. Its robust metal housing and intuitive interface make it an essential tool for accurate USB device and charger diagnostics.

## Description

USB Tester 4-28V 7A LCD USB A&C Voltage Current Power Tester Multimeter, Fast Charge Detection Trigger Capacity Ripple Measurement, PD2.0/PD3.0,QC2.0/QC3.0: 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 | #81,536 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #70 in Voltage Testers |
| Brand | FNIRSI |
| Color | multi-color |
| Date First Available | January 16, 2023 |
| Item Weight | 1.6 ounces |
| Item dimensions L x W x H | 3.23 x 1.65 x 0.47 inches |
| Item model number | FNIRSI-FNB58-bp |
| Manufacturer | FNIRSI |
| Measurement Type | Multimeter |
| Min. Operating Voltage | 4 |
| Power Source | Battery Powered |
| Product Dimensions | 3.23 x 1.65 x 0.47 inches |
| Specification Met | CE, FCC, RoHS, UL |
| Style | FNB58 |
| Upper Temperature Rating | 125 Degrees Celsius |

## Product Details

- **Brand:** FNIRSI
- **Color:** multi-color
- **Item Weight:** 0.1 Pounds
- **Power Source:** Battery Powered
- **Style:** FNB58

## Images

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

### ⭐⭐⭐⭐ USB-C can be quirky, but once you get it working it's great.
*by F***T on October 20, 2023*

First, this is a very capable little tester. For testing USB-A stuff, no complaints at all. Does what it says on the box and then some. There are even Python libraries that can read the data over the USB port so you don't necessarily have to use an app downloaded from a strange place to access the data. My only complaint - and it may not be the device's fault - is the situation with two USB-C cables. It can be difficult and require some trial and error to actually get a proper USB-C PD connection passing through the device. As I understand it, this is because despite common belief, USB-C cables *aren't* 100% reversible (i.e. flipping the connector 180 degrees doesn't always "just work" because some pins are only connected on one side of the connector) and this is one case. It might take you up to 16 tries (four connection points, two possible orientations) to actually get USB-C PD passing through the device even with the device's own PD negotiation turned off. At best you'll get 0 volts, in the middle you'll get plain 5v/2a power, and in a couple cases I saw the device crash or fully shut down even with external power provided via the PC port. In short, you need two full-function USBC-to-USBC cables to be able to passively measure charging between a USB-C charger and device, and you might have to play with reversing the connectors multiple times before you actually get a successful PD negotiation. I'd love to see a USB-C native version of this, with a USB-C port or cable directly attached to the device so you never have to worry about the two-cable pass-through situation. I do have a TC66 USB-C tester which works well but its UI leaves much to be desired compared to this one!

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-03-04*