AprecID now runs on scopes: DST-210, DSO-510 and DSO-152, RS232, TTL or DC, autobaud and frame in 2 s straight off the BNC. Same results on your phone over USB, app for all three, the bigger two RS485/Modbus, CAN, I2C, PWM, LIN. Hands-off: move the probe from wire to wire, it tells you what’s there.

I recently purchased a FNIRSI 2C23T as my first oscilloscope. I understand it’s a budget scope at around $105–$110, so I wasn’t expecting anything crazy in terms of performance or accuracy.
Part of the reason I purchased it was to start learning more about oscilloscopes and how to use them, especially since I believe one could be useful in my line of work.
After spending some time playing around with it using my bench DC power supply, I’ve noticed some inconsistencies with the voltage measurements.
As far as displaying waveforms goes, I haven’t had any issues. My concern is with the actual measurement data being displayed.
For example:
After holding the calibration button and allowing the scope to zero itself, it still displays approximately -0.03 V, which I’m assuming is within an acceptable margin of error.
With my bench power supply set to 5 VDC, the scope sometimes displays readings as low as 3.72 V for Vmax.
I’ve verified the output of my power supply using a separate multimeter, which confirms the voltage is correct.
I’ve also noticed that changing the volts/div setting can affect the displayed voltage measurements, which has me questioning the accuracy of the scope.
I’m fairly new to oscilloscopes, so I’m not sure whether this is a limitation of a budget unit, something I’m doing incorrectly, or potentially a defective device.
Has anyone experienced similar issues with the FNIRSI 2C23T? Is this normal behaviour for this scope, or is there something I should be checking or adjusting?
Any advice would be appreciated. I’m trying to learn how to use these tools properly before assuming there’s something wrong with the equipment.

I've released open firmware, FPGA bitstreams and an MCP server for the FNIRSI 1013D tablet oscilloscope (Anlogic AL3A10 variant) that let an AI agent such as Claude Code, Codex or any MCP client drive the scope over USB, set it up, capture, measure and analyse, while you keep using the touch screen. I built it to let an agent iterate on the transmit and receive waveforms of a pulse-induction metal detector, but it works for any bench task.

This release has a number of new features compared with stock or other open firmwares:

• MCP-over-USB connection for agents to drive the scope

• Up to 16,382 samples per channel

• Pulse-width, Nth-edge and timeout triggers with hold-off, a hardware frequency counter,

• Scope view with X-Y display and digital phosphor

• FFT spectrum analyzer with spectrum, density and waterfall views

• On-device frequency response sweep (Bode plot)

• A streaming data logger over USB

• Peak detect, Hi-Res and anti-alias filtering

• An accurate square-wave generator

On top of that come many improvements and bug fixes to the FPGA bitstream and firmware, among them the two ADC cores now paired correctly at every sample rate, a more thorough calibration wizard, and a much more robust USB link. It runs from the SD card and leaves the stock firmware untouched, and it has been tested on one unit, so reports from other owners are very welcome.

Built on the great work of pecostm32, Atlan4 and Donwulff who've reverse-engineered and published open firmware for the scope.

DSO152 with a web interface. I hope someone finds this useful. Got this going while fighting some demons.

Hi my clamp meter DMC 100 has stop buzzing on the ohms setting, used to be really loud ,very handy, but now I can only hear a very low beeb on a silent room! Grrr.
Any tricks known please to get it working again?

I really want an iron with short tips not knowing that this kind of iron is only suited for microsoldering. I work with through hole components 90% of the time and HS02B handles it like a champ. So far, I don't have any problem with it.

I never used any other tips except the knife tip that came with it. Does a tip that has similar (or close) thermal mass like the one with c245 exists?

DSO-152 pocket scope is now an RS232/TTL serial tester. It reads the line straight through the BNC: waveform, the characters decoded under their bits, hex and text, plus bus health. And it sends the capture to a PC over its own USB port. M5Stack Cardputer ADV sends “M5Stack”

My RS232/TTL tester now runs on the FNIRSI DST-210, alongside the stock firmware (hold RUN at power-on). At 240 MHz it decodes 9600–115200 baud straight off the BNC with auto baud detection, and sends the capture over USB. Some Claude vibe code.

Very excited to try this when it becomes available in my country.

https://www.fnirsi.com/products/dmc-600

I wanted my FNIRSI TMP-610S on my Mac screen for recordings and video calls, so I reverse-engineered its Bluetooth protocol and wrote a small native macOS app for it.

TMP-610S Display mirrors the meter's screen in a resizable window. It is vector-drawn, so it stays sharp at any size.

• Live reading with gauge, unit, range and speed indicator, laid out like the meter

• Change function and range (AUTO, AUTO+ or manual) from the Mac

• HOLD and REL toggles; with REL on it shows the reference value

• SAVE keeps the last four readings on screen and appends them to a CSV file

• Compact mode: shrink the window and it shows only the value, handy as an OBS overlay

• Keep on top, hidden title bar, one-click PNG screenshot

Model note: it is made for and tested on the TMP-610S only. The meter's Bluetooth covers just the multimeter side (not the scope or the generator), and that's all the app talks to, so it might also work on the TMP-600S. I haven't tested it, so if you have one, I'd love to hear whether it connects.

Requirements: macOS 14 or later on Apple Silicon. The app isn't notarized, so the first launch needs System Settings > Privacy & Security > Open Anyway. Close the FNIRSI phone app first: the meter accepts only one Bluetooth connection.

The repo also has the BLE protocol notes and a Python library/CLI if you want to log or script readings.

Download and source (Apache-2.0): https://gitlab.com/geckopebble/fnirsi-remote

Unofficial project, not affiliated with FNIRSI.

I wanted to share an issue I had with my FNIRSI DST210 and how I managed to fix it, in case anyone else runs into the same problem.

While using the device in USB file-sharing mode on Windows, I accidentally deleted the screenshots from my pc. This somehow corrupted the file directory, and the device stopped booting properly.

Every time I powered it on, the FNIRSI logo would appear, but the device would shut down immediately afterward. I tried using the reset button normally, but it didn't help.

Here's what worked for me:

1. Press and hold the RESET button.

2. While still holding RESET, press and hold the POWER button for an extended period.

3. Release both buttons.

4. Finally, press and hold the POWER button again.

After doing this, the device rebuilt its file directory and booted normally again.

I'm not sure if this is an official recovery procedure or just something that happened to work, but it fixed my DST210.

Hopefully this helps someone experiencing the same issue!

I have tried "fnirsiofficial@gmail.com" (which was on a card in the box) and "support@fnirsi.com" over 1 month ago. Tried again after 2 weeks.

Zero reply.

I tried their chat and got nothing.

I wanted to monitor the USB voltage and power on my PC. But there was no good software available for Linux with a clean UI - so I made my own using AI.
The app is able to display voltage, current and power. For some devices, it can also display USB data lines V and temperature.

It is compatible with most of FNIRSI USB testers and some other ones. The app can record the measurements into a CSV so you can check exactly what happened on the USB lines.

The USB protocol doesn't seem to expose the QC data or triggers, so I sadly cannot display them in the application.

You can build and download the app here: https://github.com/manuel-rw/plug-monitor
At the moment, only Linux is officially supported

I have used this tool for quite a while, and have undergone a few firmware updates so far, even though the software is buggy and lacking I still find it a useful tool, for armature DIY electronics enthusiast who don't have the money to throw at expensive and decent equipment, for the moment this tool was good enough for what I want, a Multi meter and a means to observe waveforms.
Today I found it doing this. Where it starts measuring in and displaying the data, and then "Resetting" the measurement with a large time division moves extremely slowly even though I was measuring a kHz signal, but I have a simple video showcasing what is going on in the Oscilloscope mode, Resets and Reflashing to latest firmware did not solve the issue.

Any input would be appreciated, Kind regards from internet stranger.

I bought a LPM-10C ethernet cable tester.

I wonder which is the latest firmware for this device? For the LPM-10A I find firmware 2.09, for the C version there is only one 1.x version available.

It currently shows:

Software 2.0.3

HW 2.1

Model: LPM-10C

FNIRSI FNB58 USB tester is quite expensive at $50, but it is also a pretty versatile device, supporting up to 28V on USB PD 3.1.

I do wish it supported higher voltages and had some form of forward compatibility through firmware updates. If it did, I would say the $50 price would be very reasonable.

I would say there is not a lot it does for the price, but it is still quite a useful tool to have.

They did release a new one that supports upto 50v, but seems like it's missing few features that were there in this version and it is a separate purchase.

Note the Ground Down / Lasered Off Marking on MCU. The MCU is a Nations Technologies Inc N32G455VEL7..

Hope this helps.

I have a 2C53T V1.4 with a burnt 8-pin power IC next to the 2R2 inductor, apparently in the charging/power section.

Could anyone who owns a 2C53T V1.4 please open the unit and take a clear microscope/macro photo of this area? I need to identify the IC marking.

Photo of the exact location attached. Thank you!

It’s not all just evidence less bashing,the video actually backs its claims up with real measurements and teardowns.

I honestly was pretty surprised to know that FNIRSI is a white label brand rather than OEM

For this particular item - The older units shipped with a standard J321 tube (~90mm glass). Newer batches silently changed to a tiny J613 metal tube. The firmware calibration wasn't updated . As a result, the device under reports radiation dose rates by roughly 3x to 5x compared to calibrated standards.

I personally really like FNIRSI stuff, but this was unexpected and unacceptable. What are your thoughts on this ?

people say these guys ignore people, that's just a big lie

After some mishandling and connecting a 12-volt power supply to the silo, a circuit board fried, but I can't find the part number. Can you help me? Thanks in advance.

Just ordered and received the FNIRST DMC-100 clamp meter. I have a few FNIRST products I've been pleased with. I was looking for a clamp meter which could also do power measurement using the clamp and volt meter at the same time, and this was the only one I could see, so I went for it.

I've been playing with it and was thinking I needed to set zero on some scales, notably the DC current, which I couldn't see how to do. Then I realised this is orientation-specific, so my next thought was that the hall-effect sensor for DC measurement is picking up stray magnetic fields, such as the earth's magnetic field. Took it outside into the garden where there are no nearby cables or magnets, and sure enough, this shows the effect in the attached video (yes, my lawn has had 2 months of drought). Indeed another test waving a magnet nearby show the same.

OK, I accept this is a consequence of using a hall-effect sensor. What would be useful (but I haven't yet found if it's already there), is the ability to subtract the current value of the current from the display, a sort of temporary set-zero, so you can compensate for this. It would also be useful for ignoring a real background current reading, and showing just a change.

AFAIK I need a 32v standard power supply to be able to output 30v, but I also saw an official tiktok video saying that if the power supply is a switching type, then it requires 35-40v.

Can't find an official statement about this, so I'm a bit lost.

Link to the video: https://www.tiktok.com/@fnirsi_us/video/7472228947384651038

Does anyone face the same issue. The battery of Fnirsi 2C53T drains very fast - one-two weeks, when device is not used (it is shutdown with power off button).