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. 👌

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.

I like this device a lot, but the lack of a great manual caused me to downgrade one star. Works for what i need.

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.

FNIRST just makes some cool stuff. This little tool didn't disappoint, it looks gorgeous doing it's thing. Great device for testing out chargers to make sure they do what they say, finding out the high speed charging capabilities and verifying cables. I bought it for a specific task but have ended up using it more than I expected. It's an awesome size, portable, and very accurate.

Well built, great display, functions are accurate. Handy device if you have lots of chargers, or if you are in the field and want to check out a charger before connecting your expensive devices to it.

Magical information in a small box. I have collected soooo many USB cables taking up space and I needed to thin the head of legacy cables. About 30 minutes with this very accurate device and I was easily able to weed out the slow cables using the nice display.This was a great little device that I stumbled across and a much needed cleaning of my cable drawers.

The build quality looks great, and I can tell it can do a lot. Problem is, many of the functions are very unclear how to use. It did not come with instructions, and the ones linked from the product page are so poorly translated I can't figure out a lot of what it is saying. I chose this tester over another because I thought it could do more, but if i can't figure out how to use any of the features because it's too confusing to use, then it's pointless.