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

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. 👌

This has made testing USB and monitoring them extremely easy. Has several different tools installed to moniter things like voltage and current draw, plus many others. Display is easy to read and it seems to operate accurately. Great value for your money.

Minus 1 star for the clunky user interface on the device. Works as advertised.

The FNIRSI USB Tester is a versatile tool designed for those who work with USB-powered devices, offering comprehensive analysis of USB ports, cables, and charging capabilities. This model supports a wide range of voltages and currents (4-28V, 7A) and includes features like fast charge protocol detection, capacity measurement, and ripple analysis, making it invaluable for troubleshooting, testing, or optimizing charging setups.PerformanceAccuracy and Functionality: The FNIRSI USB Tester provides accurate measurements of voltage, current, power, and other parameters. Users have found it reliable for both basic and advanced testing scenarios, including checking the performance of USB cables, chargers, and power banks. The support for various fast charging protocols (PD2.0/PD3.0, QC2.0/QC3.0) is particularly useful, allowing for the verification of fast charging capabilities.Display and Usability: The device features a 2.0-inch full-color TFT LCD display that is clear and easy to read, offering multiple display modes for different measurements. The gravity sensor for automatic display orientation adds to its user-friendliness. However, some users have pointed out that the interface can be somewhat complex for beginners due to the plethora of options and settings.Fast Charge Detection: One of the standout features is its ability to detect and trigger various fast charging protocols. This functionality is crucial for ensuring that your devices charge at their maximum supported speed, and it helps identify if a charger or cable is not performing as expected.Additional Features: Ripple measurement is another advanced feature, useful for assessing the quality of power output from USB chargers. The capacity measurement function allows users to monitor how much power a device is consuming or how much a charger can deliver over time.Design and Build QualityBuild: Encased in a durable metal shell, the FNIRSI tester feels robust and well-made. The inclusion of multiple USB ports (USB-A & USB-C) adds to its versatility, allowing for testing of different types of connectors and devices.Portability: While not the smallest device, it's compact enough for portability, coming with a storage box for protection during transport.User ExperienceEase of Use: For those familiar with electronics or USB technology, the FNIRSI tester is a boon due to its comprehensive features. However, the documentation has been criticized for being somewhat lacking, particularly in English, which might pose a learning curve for some users.Software Support: There's a PC app for extended functionality, but finding and installing it can be a challenge, as it's often not directly linked from the product page but rather from the FNIRSI website. The app adds significant value by allowing for data logging and more in-depth analysis.Pros:High accuracy in measurements.Supports a wide range of USB standards and fast charging protocols.Clear, colorful display with automatic orientation.Durable build with a metal casing.Comprehensive testing options including ripple and capacity measurements.Cons:Complex interface might overwhelm beginners.Firmware updates are necessary for optimal performance but can be tricky to install.Documentation, especially in English, could be improved for clarity.ConclusionThe FNIRSI USB Tester is an excellent choice for anyone needing a detailed analysis of USB power delivery and charging performance. Its ability to handle multiple protocols, measure various electrical parameters, and its robust construction make it a valuable tool for both professionals and enthusiasts. However, users should be prepared for a bit of a learning curve and some potential hurdles with firmware updates and software installation. If you're looking to dive deep into USB power diagnostics, this tester stands out as a comprehensive solution.

This is a great little meter that tells you just about all you need to know, relative to USB voltage and current use and charge rates, at a great price. Easy to use and store. It has so much info on the small screen that I need to use readers to be able to see it all (I am getting older!).

Ths is a niche market product, intended for those who want to verify electrical performance of cables and plugs. Originally, I purchased a less functional equivalent (for a fraction of the price) but I soon found that what i wanted to test could not be done with what I had. So I expanded my search and found this product. I can now verify and trace issues with charging cables or to plug connected devices. This unit can verify the charge from either a 120v plug or a battery pack. There are videos online about how to use, so you're never without some kind of visual aid.I purchased my model during the October Prime event, so there was a discount to my purchase. However, if you're a techno nerd and either want or need this right away, and are willing to pay full price, it's not a bad price. Just know that it goes on sale from time to time.