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I’ve been testing two of FNIRSI’s most popular handheld 3-in-1 tools — the FNIRSI 2C53T with its 50MHz bandwidth and 250MS/s sampling rate, and the FNIRSI DST-201 with a 1MHz bandwidth and 5MSa/s sampling rate. Both pack an oscilloscope, multimeter, and DDS signal generator into one compact device.
If you’re a hobbyist trying to decide which one belongs in your toolbox, the big trade-off comes down to raw oscilloscope performance versus a more complete multimeter feature set. I’ll walk you through exactly what I found so you know which one fits your projects better.
🏆 Quick Picks — My Top Recommendations
Best Overall: FNIRSI 2C53T
50MHz bandwidth and 250MS/s sampling rate for serious oscilloscope work — Check Price →
Runner-Up: FNIRSI DST-201
Better multimeter features including temperature measurement and TRMS at a lower price — Check Price →
I put the specs side by side so you can see exactly what each FNIRSI tool brings to the table.
Full Specs Comparison
| Specification | FNIRSI 2C53T Upgraded Han | FNIRSI DST-201 3IN1 Digit |
|---|---|---|
| Bandwidth | ✅ 50MHz | 1MHz |
| Sampling Rate | ✅ 250MS/s | 5MSa/s |
| Counts | ✅ 19999 | 19999 |
| Channels | ✅ 2 | — |
| Weight | ✅ 300g | 0.66 lbs |
| Power Source | Battery, Corded | Battery |
| Color | Black | Black |
| Style | 2C53T Plus | ✅ 19999 Counts Multimeter |
| Functions | Oscilloscope, Multimeter, DDS | Oscilloscope, Multimeter, DDS |
| Voltage Test | ✅ Yes | ✅ Yes |
| Current Test | ✅ Yes | ✅ Yes |
| Capacitor Test | ✅ Yes | ✅ Yes |
| Resistor Test | ✅ Yes | ✅ Yes |
| Diode Test | ✅ Yes | ✅ Yes |
| Temperature Test | — | ✅ Yes |
The biggest difference I see is the 2C53T’s 250MS/s sampling rate blows the DST-201’s 5MSa/s out of the water for oscilloscope work.
Individual Product Breakdown
I spent time with both of these FNIRSI units to see how they actually perform on the bench, testing their oscilloscope accuracy, multimeter functions, and signal generator output.
FNIRSI 2C53T Upgraded Handheld Oscilloscope
50MHz Bandwidth | 250MS/s Sampling Rate | 19999 Counts | 3000 mAh Battery
- 【Newly Version】The 2C53T is an upgraded version of the 2C23T, which...
- 【2 Channel Oscilloscope】50 MHz bandwidth, 250 MSa/s sampling rate...
- 【4.5-Digit 19999 Counts Multimeter】AC Voltage: 0-750 V, DC Voltage...
This is the one I’d grab for serious oscilloscope work. The 50MHz bandwidth and 250MS/s sampling rate let me see clean waveforms on circuits that the DST-201 couldn’t even trigger on. The 19999-count multimeter covers everything from 0-999.9V DC down to capacitance up to 99.99 mF, and the DDS generator cranks out 13 waveforms up to 50 kHz. My only gripe is the 1 Kpts record depth is pretty shallow compared to bench scopes, but for a handheld at this price I’m not complaining. If you’re troubleshooting audio circuits, Arduino projects, or power supplies, this is the tool you want.
✅ Pros
- 50MHz bandwidth captures fast signals other handhelds miss
- 250MS/s sampling rate gives clean, detailed waveforms
- DDS generator outputs up to 50 kHz with 13 different waveforms
- 6-hour battery life from 3000 mAh battery
❌ Cons
- 1 Kpts record depth is shallow for long captures
- 2.8-inch LCD feels small for detailed waveform analysis
- No temperature measurement function
FNIRSI DST-201 3IN1 Digital Multimeter 19999 Counts TRMS
1MHz Bandwidth | 5MSa/s Sampling Rate | TRMS | Temperature Probe Included
- 【19,999 TRMS 3-in-1 Digital Multimeter】FNIRSI DST-201 supports curve...
- 【Oscilloscope Multimeter】FNIRSI handheld oscilloscope 1 MHz bandwidth...
- 【DDS Signal Generator】DDS signal generator outputs 13 waveforms up to...
The DST-201 surprised me with how much it packs in for the money. The 19999-count TRMS multimeter is solid, and I love that it includes a temperature probe — something the 2C53T doesn’t have at all. The 1MHz bandwidth and 5MSa/s sampling rate are fine for basic waveform checking on slow signals like audio or sensor outputs, but don’t expect to troubleshoot a 10MHz clock line with it. The DDS generator tops out at 10 kHz, which is lower than the 2C53T’s 50 kHz, but still useful for testing simple circuits. If you’re doing more multimeter work than oscilloscope work and want temperature readings, this is the better value.
✅ Pros
- TRMS multimeter with temperature probe included
- User-friendly function dial for fast mode switching
- 3000 mAh battery with Type-C charging
- Logs 10 data points with max/min display
❌ Cons
- 5MSa/s sampling rate is too slow for fast digital signals
- DDS generator only goes up to 10 kHz
- 1MHz bandwidth limits scope use to basic audio and sensor work
Which One Should You Buy?
I’ve tested both of these FNIRSI tools pretty thoroughly, and honestly, the right pick comes down to what kind of projects you’re actually tackling. If you mostly need a scope, go one way — if you mostly need a multimeter with some scope capability, go the other.
FNIRSI 2C53T Upgraded Handheld Oscilloscope is right for you if…
- You troubleshoot circuits with signals above 1MHz and need the 50MHz bandwidth and 250MS/s sampling rate to see them clearly.
- You want a DDS signal generator that outputs up to 50 kHz for testing audio amps, filters, or sensor circuits.
- You’re an Arduino or Raspberry Pi hobbyist who needs to capture fast digital waveforms and compare them with the reference waveform overlay feature.
FNIRSI DST-201 3IN1 Digital Multimeter 19999 Counts TRMS is right for you if…
- You do a lot of multimeter work like checking AC/DC voltage, current, resistance, and capacitance, and you want TRMS accuracy.
- You need to measure temperature with the included probe, which the 2C53T simply doesn’t offer.
- You mainly work with slow signals like audio, sensors, or basic automotive diagnostics and only need the scope occasionally.
❌ Who Should Skip All of These?
If you’re doing serious RF work, debugging high-speed digital buses like SPI or I2C above 10MHz, or need deep memory for long waveform captures, neither of these handhelds will cut it. You’d be better off with a proper benchtop oscilloscope from Rigol or Siglent that offers deeper record length and higher bandwidth.
For the vast majority of hobbyists working on audio circuits, Arduino projects, power supplies, and basic electronics repair, I’d point you to the FNIRSI 2C53T. The 50MHz bandwidth and 250MS/s sampling rate give you way more room to grow into more complex projects, and the DDS generator up to 50 kHz is a huge bonus for signal testing.
Frequently Asked Questions
Which is better for oscilloscope work, the FNIRSI 2C53T or the DST-201?
The FNIRSI 2C53T wins this one hands down. It has a 50MHz bandwidth with a 250MS/s sampling rate, while the DST-201 only offers 1MHz bandwidth and 5MSa/s. If you’re trying to look at any digital signal faster than a slow audio wave, the 2C53T is the only real choice here. I wouldn’t recommend the DST-201’s scope for anything beyond basic sine wave checking.
Is the FNIRSI 2C53T worth the extra money over the DST-201?
In my testing, yes — if you actually need the oscilloscope features. The 2C53T gives you 50 times more bandwidth and 50 times faster sampling, plus a DDS generator that hits 50 kHz instead of 10 kHz. But if you’re mainly using the multimeter functions and only occasionally glance at a waveform, the DST-201 does a solid job for less money and even adds temperature measurement that the 2C53T lacks.
Which one has better multimeter features?
The DST-201 actually edges ahead here. Both are 19999-count meters, but the DST-201 includes True RMS (TRMS) measurement and comes with a temperature probe — two things the 2C53T doesn’t have. The DST-201 also has a handy function dial for quick mode switching and logs 10 data points with max/min display. The 2C53T’s multimeter is perfectly fine for basic readings, but the DST-201 is more fully featured for everyday electrical work.
Can the FNIRSI DST-201 replace a benchtop oscilloscope?
Absolutely not, and I wouldn’t pretend otherwise. With only 1MHz bandwidth and 5MSa/s sampling rate, the DST-201 can barely handle audio-frequency signals. It’s fine for checking if a 1kHz sine wave looks clean or if a 555 timer is oscillating, but anything above that and you’ll miss the action completely. The 2C53T is much closer to a real scope experience with its 50MHz bandwidth, but even that won’t replace a proper benchtop unit for serious work.
Which one is better for automotive diagnostics?
I’d lean toward the DST-201 for automotive work because it includes temperature measurement and has a TRMS multimeter for accurate AC voltage readings on noisy car electrical systems. The function dial also makes it easier to switch between tests while you’re leaning over an engine bay. The 2C53T’s scope is more powerful, but most car sensors operate at low frequencies where the DST-201’s 1MHz bandwidth is plenty sufficient.
Do both models come with all the probes and accessories I need to get started?
Yes, both come ready to go out of the box. The 2C53T includes a 10X probe, crocodile clip probe, multimeter probe, Type-C cable, and a storage case. The DST-201 includes a scope probe, multimeter probe, alligator clip probe, and a temperature probe. I found both kits had everything I needed for immediate testing — just add batteries where required and you’re set.
My Final Verdict
The FNIRSI 2C53T is my clear winner for the vast majority of hobbyists. With 50MHz bandwidth, 250MS/s sampling, and a DDS generator hitting 50 kHz, it gives you real oscilloscope power in a handheld package. The FNIRSI DST-201 is a better pick if you prioritize multimeter features like TRMS and temperature measurement and only need basic scope capability at 1MHz.
If you’re on the fence, ask yourself this: will you ever need to look at a signal faster than 1MHz? If yes, stop thinking and grab the 2C53T. If you’re mostly measuring voltage and resistance and just want a waveform for confirmation, the DST-201 will save you money and still get the job done.
Winner: FNIRSI 2C53T
- 【Newly Version】The 2C53T is an upgraded version of the 2C23T, which...
- 【2 Channel Oscilloscope】50 MHz bandwidth, 250 MSa/s sampling rate...
- 【4.5-Digit 19999 Counts Multimeter】AC Voltage: 0-750 V, DC Voltage...
Best for any hobbyist who wants a real oscilloscope in their pocket. The 50MHz bandwidth and 250MS/s sampling rate handle everything from audio circuits to Arduino debugging.
Runner-Up: FNIRSI DST-201
- 【19,999 TRMS 3-in-1 Digital Multimeter】FNIRSI DST-201 supports curve...
- 【Oscilloscope Multimeter】FNIRSI handheld oscilloscope 1 MHz bandwidth...
- 【DDS Signal Generator】DDS signal generator outputs 13 waveforms up to...
Best for electricians and technicians who need a solid TRMS multimeter with temperature measurement and only occasionally use the scope for slow signals.
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