It is similar to the previous one, as it displays information about current, voltage and power. Resolution: 0.0001 V/A As you can immediately notice, in terms of physical dimensions of this four, the hero of the review can be considered one of the most compact (65.4×23.1×11.4mm). Install everything you need and change the system language to English (the same problems with Cyrillic as before).
In working order:
The fifth table is the settings menu. Computer software is still buggy and not friendly with Cyrillic.
Second table. As you can see, it is not so large – about 0.024A.
Two buttons K1 and K2 are located on the upper end of the case. 4. auto test recording ON/OFF, Brand: FNIRSI The case breaks up into separate parts, where the main one is the central one – a board with a screen, ports and all controllers. 12. reset
all settings. The presence of a fully functioning automatic trigger (detector) of protocols expands the available possibilities. In my memory, this is the cheapest tester with such a function that you can easily buy on the aliexpress site.
You can run both automatic and manual checks. 3. standby time, Packaging and appearance From left to right are: FNB28, JUWEI J7-4T Oled, RD UM24, RD UM25. Displays current, voltage, current power, test time, total time, group number, mAh and Wh counters.

Affordable USB tester Fnirsi FNB28 with color screen, auto trigger and software update.

Trigger: Yes, Manual/AUTO: Qualcomm QC2.0/QC3.0/Huawei FCP/SCP/Samsung AFC There is no dedicated ADC. Model: FNB28 Follow the link below and download the program we need and the latest firmware. For less than $10, it will be difficult to find a competitor with the same functionality (perhaps there is none yet).
The appearance of the device resembles a "sandwich" – an assembly of separate parts that are well distinguished from each other.
In the end, let’s look at the main features of the tester itself. Added to this are the voltage readings on the data lines (D D-), temperature and the current protocol.
In my household there were several similarly priced models from other manufacturers. A simple screen that displays information about voltage, current, current power and resistance in large text. This is as easy to do as any similar USB tester. 9. temperature C/F,
The main controller is again from STM32 (marked as F150GB), shunt 0.004 Ohm, non-volatile memory from Atmel EEPROM < b>ATMLH907 32DM at 32KB, there is also a 7333 voltage regulator and a Schottky diode. Of course, there were some minuses, here they are also available.
Third table. This is the very trigger of charging protocols, so expected by many.
The tester does not have such a mode in which the screen would turn off its backlight completely, so I decided to measure my own consumption. Official repository: Built-in temperature sensor. Next, while holding down the "K1" button, we connect the tester to any free port on the computer. I decided to take a group photo to compare them at least visually. Long holding the "K1" button resets all readings. There are five virtual desktops available for the end user: 7. the minimum current value from which the counting of values ​​starts,
Internal structure 6. test recording time AT THE SET TIME, The scope of this USB tester, slightly different from the one that was previously already, was in my review (we are talking about the Fnirsi FNB88 USB-C). The tester is endowed with all the main features that may be useful to the end user. The only thing that can be seen from the new is the mention of the brand in large text (this has not happened before). I would like to see modern USB-C ports, on which the manufacturer decided to save money. Measured voltage: 4 – 24V Review published in accordance with clause 18 of the Rules In fact, it really is. The main ones I will include: a 0.96-inch color screen, the presence of a full-fledged automatic trigger for charging protocols, the ability to update your own software.
Color screen 0.96 inches, exactly the same as in the Fnirsi FNB88, RD TC66 and RD TC64 models.
Fourth table. The model itself is simple, without additional interfaces (no Type-C or microUSB ports), but at the same time it is currently affordable, with a really working trigger.
On the reverse side there are graphic hints of the main controls, as well as brief performance characteristics. 8. write to memory YES/NO, The device will go into bootloader mode, displaying the number of the current software (in my case, firmware version 1.00 was installed).
There are not many ports in the FNB28, which is generally considered the norm for a budget tester. 11. screen rotation,
A long press of the "K2" button switches to the chart mode. There is no equipment as such: the seller did not put anything other than the tester. 10. language EN/CN, It displays the software version, serial number, number of device starts, as well as 12 items: Measured current: up to 5A First table. The product was provided for writing a review by the store. There is one USB-A (male) and one USB-A (female). Four screws are removed from the front and four from the back. The procedure takes half a minute. I will show the procedure for changing the firmware right away, before parsing all the main features (but in fact I did it after, because I forgot about such a chip). Next, we will analyze and look at the device from the inside in order to understand what it is built on. Easily updated to the latest firmware, remembers the last selected desktop, easy to manage. 1. display brightness in main mode, Main types supported: Qualcomm QC2.0, QC3.0, Huawei FCP, Huawei SCP, Samsung AFC. Both standards are 2.0. Capacity: up to 99999.9 mAh or 9999.99 Wh, 4 cell memory
Specifications: 2. display brightness in standby mode, The front screen is protected by a thin acrylic plate, which will quickly become covered with small scratches in a short time.
Open the FNB28 DFU Tool v1.00 program, select the required firmware file in it and press START. Interface: USB-A (male), USB-A (female) Arrives in a familiar metal box with a transparent window on the front. 5. test recording time WITHOUT LIMITS, This is understandable, the past is designed for devices with Type-C ports, while this one is designed for conventional USB-A. The novelty undoubtedly turned out to be interesting, especially in terms of a fully functioning trigger of charging protocols. The new Fnirsi FNB28 is another USB tester from the Chinese with a number of interesting features. However, they apply in the same way.
Application in practice Software update With its compact size, it will be especially convenient to use when testing closely spaced USB ports. According to the manufacturer, the FNB28, like the FNB88, supports a quick update of its own software.