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

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.

I’ve been impressed with the FNIRSI USB tester’s build quality. Unlike many testers on the market, which often resemble beta models with open sides or no casing, the FNIRSI is encased in a professional housing with input ports for USB-C, Micro USB, and USB-A.I’ve used the USB-C eMarker check to test cables, which works well. The tester is supposedly capable of measuring cable resistance, but I haven’t figured out how to do this yet. Instead, I purchased a Treedix cable tester, which is battery-powered and can measure resistance. Treedix also includes a Lightning port for testing Apple cables.I’ve tested several battery banks to verify if they deliver the power promised in their advertising. The included instructions were minimal, but I found documentation on the FNIRSI website. Initially, I struggled to trigger higher Power Delivery (PD) voltages (beyond the standard 5V) on the USB load meter. Watching YouTube videos helped me navigate the PD trigger menu effectively.A firmware update is available on the FNIRSI website, but I haven’t applied it yet, as the accompanying app seems unreliable. I plan to test it on a sandboxed PC to ensure safety.I liked the tester so much that I bought a second unit. This allows me to use the PD trigger to test the load on multiple ports of a power bank simultaneously.I’m still learning how to fully utilize the tester, particularly the PC logging feature, which I hope to explore further.

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

Well made USB tester. I love the fact that it can read the USB-C marker chip allows me to determine the configuration of my cables as far as wattage and speed rating - allows me to externally mark the cables and get maximum performance from all my peripherals. Significantly more expensive than most other testers, but build quality and extra testing features make the expense worthwhile.

If you do any level of hacking/developing/design using usb you know how valuable seeing whats happening on the wire is. I will say im impressed what they packed into this little thing for the price.I didnt think i would value the graph display at first but its turned out to be quite handy.Took a few mins to grok the different options and navigations but was kind of fun poking about.Im quite happy with this unit.

Works as I expect it to, helped me diagnose and repair some electronics which is why I bought it, so I'm very happy with it. I think I'd prefer the USB A male port to be on a cable rather than sticking out of the device, but not a big deal.

The manual is not very good, and the firmware update instructions are inadequate.1. In Windows you have to right-click the firmware file that you download, choose "Properties", and check the "unblock" box.2. You also need to use a USB port on your computer with full 5v power. Some computers have very low powered USB ports that will power up the device but not provide enough power to get all the way through the update process.The device seems capable, but the manual is inadequate and the user videos on Youtube are not clear or accurate in all cases.

I have a couple of older USB testers but this is definitely the best. It takes either USB-C or USB-A. It has a lot of features that I'm not even using. I find it best for monitoring things that request higher USB voltages with the modern USB standards. If I have a large battery charger that promises 60W charging then this device can show that to me.