FNIRSI DSO-TC4 Handheld Oscilloscope, 10MHz Bandwidth 48MSa/s Sampling Rate Digital Oscilloscope Transistor Tester DDS Signal Generator 3 in 1, Voltage Continuity Zener Diode Triode Component Tester : �鶹��.ca: Industrial & Scientific

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FNIRSI DSO-TC4 Handheld Oscilloscope TransistorFINRSI Technology

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FNIRSI DSO-TC4 Handheld Oscilloscope, 10MHz Bandwidth 48MSa/s Sampling Rate Digital Oscilloscope Transistor Tester DDS Signal Generator 3 in 1, Voltage Continuity Zener Diode Triode Component Tester

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【3 in 1】FNIRSI DSO-TC4 oscilloscope transistor tester DDS signal generator, 10 MHz bandwidth, 48 MSa/s sampling rate, max voltage 400 V, vertical sensitivity 10 mV/div~10 V/div, can accurately capture and analyze signal, waveform image storage and export
【Transistor Tester】FNIRSI DSO-TC4 can test diodes, triodes, field effect transistors, capacitors, resistors and other components, automatically identify pins and parameters, support NEC IR decoding. Ideal for debugging and repairing remote control devices
【DDS Signal Generator】It has 13 waveform outputs, frequency range 0~50KHz, output voltage adjustable 3V, suitable for various signal simulation tests
【Intuitive & Portable】The handheld digital oscilloscope uses a 2.8" HD TFT screen with adjustable brightness for different lighting environments. It features a 1500 mAh lithium battery with auto shutdown (15/30/60 mins) for energy saving
【Rich Functions】The oscilloscope transistor tester supports voltage measurement, continuity test, DS18B20 temperature sensor, DHT11 sensor, automatic calibration, offering convenient testing support for development and maintenance

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Product details

Batteries ‏ : ‎ 1 Lithium Polymer batteries required. (included)
Product Dimensions ‏ : ‎ 14.15 x 8.99 x 2.69 cm; 410 g
Date First Available ‏ : ‎ April 2 2025
Manufacturer ‏ : ‎ FNIRSI
ASIN ‏ : ‎ B0F13SYGGL
Item model number ‏ : ‎ DSO-TC4
Country of origin ‏ : ‎ China
�鶹�� Rank: #17,504 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
- #23 in Lab Oscilloscopes
Customer Reviews:
29 ratings

This item: FNIRSI DSO-TC4 Handheld Oscilloscope, 10MHz Bandwidth 48MSa/s Sampling Rate Digital Oscilloscope Transistor Tester DDS Signal Generator 3 in 1, Voltage Continuity Zener Diode Triode Component Tester

$95.99

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Customer reviews

29 global ratings

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Patrick
Awesome DIY Tool
Reviewed in Canada on July 14, 2025
Verified Purchase

Does a great job of identifing components; as well as other features.

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boulay
testeur de pièce électronique
Reviewed in Canada on June 10, 2025
Verified Purchase
le testeur fonctionne mais il de se trompe souvent de pièce comme transistor il trouve une diode .
et impossible de le mètre a jours .

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Top reviews from other countries

Anonymous+
10 Mhz scope pocket size!
Reviewed in the United States on June 18, 2025
Verified Purchase

A remarkable 10 megahertz transistor curve tracer fits in your pocket
Works on rechargeable batteries. Also functions as a volt/amp, continuity, capacitor, resistance, diode, led checker. Indoor for scoping to 10 Mhz .
Most functions are automatically adjusted.

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jason e furgason
CHECK THE BATTERY BEFORE USING!
Reviewed in the United States on July 13, 2025
Verified Purchase
*** See note below for a warning ***
I use this in the field to diagnose issues with common parts. So far it has correctly identified good/bad componets saving me time of not having to disassemble boards and take back to the shop to troubleshoot. It has some limitations, but I knew what I was getting when I purchased it and it does exactly what I needed it to do. Would have given 5 stars if not for the one issue noted below.
** WARNING ***
BE SURE TO OPEN UP AND CHECK THE BATTERY PACK!! There are some pcb component leads that were not trimmed short enough at the factory and that can lead to a pierced battery pack! Not sure if this has been corrected yet or if it was just a limited amount of production run errors. When I checked mine, sure enough, it had dents in the outer packaging, but not pierced. Had it been dropped or mishandled it could have been a bad situation. I trimmed the leads and reassembled it with an extra layer of padding between the pcb and battery pack and have not had any issues yet. Overall I am happy with this tool.

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Samuel James
Your Pocket-Sized Quantum Foam Analyzer (Not Quite) But Feature Rich and Handy for Sure!
Reviewed in the United States on June 22, 2025
�鶹�� Vine Customer Review of Free Product( What's this? )
When your Tektronix scope wheezes like an asthmatic steam engine and takes up more bench space than a disassembled tractor, you know it’s time for an upgrade. As someone who once debugged Farnsworth-inspired fusor circuits on a mountainside during a snowstorm, I craved something portable, rugged, and unapologetically clever. Enter the FNIRSI DSO-TC4—a 3-in-1 Swiss Army knife for electrons that fits in a pocket and costs less than a decent bottle of bourbon.

How I Tested It (My Testing Methodology)

Lab vs. Wild:
Bench-tested against a Rigol DS1054Z (50MHz) on Arduino PWM signals → deviation < 3%.
Field-tested in -5°C wind (Alma, CO) diagnosing a snowmobile’s erratic tach signal (at least I had something that helped figuring things out0. to figure things out.

Signal Generator Gauntlet:
Output 13 waveforms (sine to random noise) → fed back into scope input → fidelity validated.

Transistor Torture Test:
Auto-identified 47 components (FETs, zeners, BJTs) from my "junk bin of shame."

Real-World Abuse:
Survived a 4-ft drop onto a concrete garage floor (encased in silicone, but still).
Battery life: 4.2 hrs continuous use (matching spec).
And my thoughts are...

The GOOD (what I liked)

Trifecta of Tricks:
Scope + component tester + signal gen = bench freedom. Debug IR remotes → generate test signals → scope the chaos → all on one device. I think of it being like Mr. Spock's tricorder mated with a soldering iron.

Transistor Whisperer:
Auto-pin detection nailed every TO-92 and SOT-23 I threw at it. Even decoded my neighbor’s ancient NEC A/C remote!

Signal Gen Savvy:
0-50kHz waveforms cleaner than a nun’s conscience.
Sine waves purred; square waves snapped.
Think of it as a theremin for electrons (and if you have no idea what I'm talking about, the theremin is an electronic musical instrument controlled by hand gestures near two antennas. It was Invented by Leon Theremin in 1920).

Altitude-Proof:
-5°C? 10,000 ft? No drift.
The screen stayed crisp as Ute’s pancakes. (Miss Ute is my German friend with whom I have Kaffeeklatsch)

Battery Zen:
1500mAh lasted through a full fusor coil debug session.
Auto-sleep saved it from my TBI forgetfulness.

The BAD (Things that make me cringe)

Screen Squint: 2.8" feels tiny tracing 10MHz signals (my 50yo eyes wept).
My creative fix was a $5 magnifying visor.

No PC Connectivity
Can’t export waveforms for reports or late-night analysis.
My Fix: Use my iPhone camera (stone age style).

The Verdict:
Captain Kirk Would’ve Jettisoned the Tektronix!

For under $100, this isn’t just a tool—it’s a pocket revolution. It won’t replace your lab’s $10k scope or that $130K one that R&D keeps under lock and key (not to mention the security in that part of the building), but for field repairs, hobbyist tinkering, or debugging a quadcopter in a blizzard? Pure genius. It’s the electronics equivalent of remembering a Toshiba model number against all odds—a small, defiant victory.

BUY IT IF:

Your workbench is a tailgate/café table/mountainside.
You fix things labeled "Here There Be Dragons."
Value portability > petabytes.

SKIP IT IF:
You analyze 100MHz RF ghosts.
Need deep memory or Ethernet streaming.

BOTTOM LINE

Holding it, I felt like my 10yo self on that bayou porch—Captain Kirk with a tricorder, ready to boldly probe what no man had probed before. The FNIRSI? It’s my USS Enterprise for the quantum foam.

It works, it is accurate, and I still want to know why I couldn't have one when I was in college getting that first degree...or even the second one for that matter!

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midNight noctOwl
Very functional and diverse features. Quick. Accurate.
Reviewed in the United States on May 3, 2025
�鶹�� Vine Customer Review of Free Product( What's this? )
This handheld device has a lot of features that not only makes life easier, but it's also becoming a primary tool for testing components and even grading them before usage.

I've really fallen in love with the transistor tester because it appears like it can almost test anything and it does so quickly and accurately. My primary work with this tool has been with capacitors, resistors, and diodes. Mostly checking the quality of the parts before they are used. It has really sped up the whole process with the auto testing since it will identify what you put in, which reduces the amount of time you need to fumble around with settings, or making sure you get the leads in to the correct test slots/holes.

This tester has been so helpful, for fun, I got out some of my older components that are pushing closer to 30 years since I was wanting to see how they stood up to testing and to see what kind of quality I was sold way back when. Almost everything panned out to be as expected, except for a strip of 10k ohm resisters (brown, black, orange, gold) that actually tested at 3.3k ohms. I tested about a dozen of them, and they were all consistently registering around 3.3k ohms. I found it amusing that 3.3k's were packaged as 10ks, but at least now I know why I had problems with a few projects that caused a lot of pain. I did not test all of my old stashes of strips of resistors, but I suspect others could have been improperly marked too. So for component testing alone, I'm seeing how invaluable this is.

This comes with a various number of test leads, which have come in handy, but I can also see where it could be worth while picking up something a little more specific if your work may benefit from it. The set provides a few micro clips, but the leads are a little short, so I may consider finding longer leads eventually. I do like how there is an adapter for BNC connectors, since I have a couple of older oscilloscope leads I would like to use and see how well they work.

I've used the signal generator a little, but not that much. Mostly in the lower frequencies and it has worked great for my current needs. I really appreciate the options and wave forms that it provides and I am planning on using it more in the near future.

Although the primary function of this is an oscilloscope, it has not been the mode that I have been using. What I've seen and played around with has exceeded my expectations, but I just haven't been able to spend as much time as I would like exploring those options. There are a few jobs I'm needing to use it on in the near future, so I'm looking forward to that for certain.

Overall this has proven to be a great value, with all of the capabilities and automated testing, it's simplified some of the mundane tasks, plus I think it's improved reliability too. This is becoming one of my favorite and most useful tools.

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letmepicyou
Awesome little tool!
Reviewed in the United States on April 23, 2025
�鶹�� Vine Customer Review of Free Product( What's this? )
When I learned how to use an oscilloscope, it was a big, expensive, metal box that was the size of a very large, heavy briefcase. That was literally as small as you could get them, and it hasn't been so long ago. A capable function generator was again as large, and both together could run you more than $5,000+, and that was for bottom of the barrel gear.

Now, you can get both devices and even more, in this device small enough to fit in your pocket, and the capabilities of this exceeds the equipment I learned on in every way, shape, and form. With 10MHz bandwidth and 400v max voltage, there's a lot you can do with this. If I had to wish at the oscilloscope side of things, I would perhaps wish for a bit more bandwidth (50MHz would be nice), but for something that fits in your pocket, if you aren't using it to diagnose 2.4GHz Wi-Fi equipment, you probably won't run into the 10MHz ceiling.

On the function generator side of things, it puts out more waveforms than, frankly, I knew existed. Sine, square, sawtooth, are of course all present, and a bunch of waves I never learned when I took electronics, lol. I'm sure they're all useful, just many of them I'm not 100% certain what for. Once again, I have to wish at the function generator side of things as I wish the amplitude would hit 5 volts, which would make it much more useful for car audio folks, but 3 volts isn't terrible, and of course it does other stuff, too.

Things like, ordinary voltmeter functions, capacitance, transistor, diode check, etc., all combine to make this a heck of a tool you can stick in your pocket and carry around with you. For less than $100!!! 30 years ago, if you would have told me you had an oscilloscope and function generator in one (with a ton of other additional features) for less than $100, I would have laughed at you and told you to get out of my shop, lol. As someone that learned on much older equipment, I must comment about what a wonderful modern age we live in today.

It hasn't replaced my 5GHz benchtop o-scope by any means, but by golly it sure is a wonderful little tool for what it is. Whether you're a serious tech just looking for a convenient o-scope you can take anywhere, or you have someone in your life showing an interest in electronics and looking to get started, this is a fantastic tool for either. For the pro, you're getting an awesome level of capability you can carry in your cargo pants, and for the amateur you're getting an entire lab's worth of test gear in a single device that you won't have a problem finding room or the budget for. For either individual, this is a heck of a buy and a wonderfully capable tool. 5 stars.

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