---
product_id: 506601492
title: "FNB58 Standard USB Tester"
brand: "fnirsi"
price: "KSh18493"
currency: KES
in_stock: true
reviews_count: 13
category: "Fnirsi"
url: https://www.desertcart.co.ke/products/506601492-fnb58-standard-usb-tester
store_origin: KE
region: Kenya
---

# Supports QC2.0/QC3.0, PD2.0/3.0 fast charge protocols 2.0-inch TFT LCD display Measures voltage, current, power, capacity with 16-bit ADC FNB58 Standard USB Tester

**Brand:** fnirsi
**Price:** KSh18493
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your diagnostics with precision and speed!

## Quick Answers

- **What is this?** FNB58 Standard USB Tester by fnirsi
- **How much does it cost?** KSh18493 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.ke](https://www.desertcart.co.ke/products/506601492-fnb58-standard-usb-tester)

## 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

- • **Crystal-Clear 2.0" TFT Display:** Instantly visualize voltage, current, and power data with vibrant clarity and auto-rotate for seamless monitoring.
- • **Precision 16-bit ADC Measurement:** Experience ultra-accurate readings of voltage, current, resistance, and ripple with professional-grade sampling rates up to 4M sps.
- • **Advanced Cable & Chip Diagnostics:** Decode E-Marker and DASH cable data, plus measure wire resistance and onboard temperature — all in one sleek device.
- • **Compact, Rugged & Ready for Field Use:** Lightweight metal case with intuitive controls and a protective storage box — built for the tech-savvy pro on the move.
- • **Universal Fast-Charge Protocol Support:** Effortlessly trigger and detect QC2.0/3.0, PD2.0/3.0, VOOC, and more — stay ahead in the fast-charging game.

## Overview

The FNIRSI FNB58 USB Tester is a professional-grade multimeter featuring a 2.0-inch TFT LCD, 16-bit ADC for ultra-precise voltage, current, and power measurements, and broad compatibility with fast charging protocols including QC2.0/3.0 and PD2.0/3.0. It offers advanced cable diagnostics, ripple measurement, and onboard temperature sensing in a compact, durable metal housing, making it an essential tool for tech professionals and enthusiasts who demand accuracy and versatility in USB power testing.

## 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 | #147,807 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #119 in Voltage Testers |
| Brand | FNIRSI |
| Brand Name | FNIRSI |
| Color | multi-color |
| Customer Reviews | 4.4 out of 5 stars 184 Reviews |
| Included Components | USB Tester |
| Item Dimensions | 3.23 x 1.65 x 0.47 inches |
| Item Weight | 0.1 Pounds |
| 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 |
| Part Number | FNIRSI-FNB58-bp |
| Power Source | Battery Powered |
| Specification Met | CE, FCC, RoHS, UL |
| Style | FNB58 |
| Style Name | 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

![FNB58 Standard USB Tester - 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.

### ⭐⭐⭐⭐⭐ Works for me!
*by M***E on March 27, 2024*

My experience with scopes is pretty limited, so take this as the opinion of a FW/SW dev. I love this little guy. Power consumption measurement of MCUs has been elusive until now. The sampling resolution doesn't blow me away, but it is good enough for my needs. Very easy to read and use. I found the menu system on the intuitive side, which surprised me. A like its size as well. At first I was wishing for a bigger screen. After using it for a while, I found that the smallish size is great because now I can leave it connected all the time without hogging up desk space. Excellent. And for the record, I've seen no evidence of interference with MCU D+/D- signals. Wish I'd picked this up a long time ago.

## Frequently Bought Together

- 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
- Treedix USB Cable Tester Board USB Cable Checker Data Wire with Acrylic Case Charging Test Data Line Type-C Micro Type A Type B
- DROK USB Load Tester, Electronic Load Test Resistor Module 25W LD25 USB and Type C Interface Discharge Adjustable Constant Current 0.25A-4A Intelligent Temperature Control with Cooling Fan

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.co.ke/products/506601492-fnb58-standard-usb-tester](https://www.desertcart.co.ke/products/506601492-fnb58-standard-usb-tester)

---

*Product available on Desertcart Kenya*
*Store origin: KE*
*Last updated: 2026-07-24*