Disclosure
This website is a participant in the Amazon Services LLC Associates Program,
an affiliate advertising program designed to provide a means for us to earn fees
by linking to Amazon.com and affiliated sites.
If you need to track voltage drops over time or log current fluctuations on a project, a standard multimeter just won’t cut it. You need a tool built for data logging, and FNIRSI makes several models that actually do this well. I spent weeks testing their lineup to find the ones worth your money.
I picked these 9 based on three hard rules: each one must offer some form of recording or data monitoring mode, have at least 19999 counts for precision, and be portable enough to use in the field. A few are specialized for battery testing or USB power monitoring, but every single one here can log data reliably.
Quick Comparison: best FNIRSI Multimeter for data logging
| # | Product | Best For | Key Spec | Price |
|---|---|---|---|---|
| 1 | FNIRSI 2C53P Top Pick |
Best overall data logger | 50MHz Bandwidth | Check Price → |
| 2 | FNIRSI 2C53T Amazon’s Choice |
Versatile 3-in-1 logging | 50MHz Bandwidth | Check Price → |
| 3 | FNIRSI DMT-99 Amazon’s Choice |
Dedicated monitoring mode | 9999 Counts | Check Price → |
| 4 | FNIRSI DMC-100 Clamp Meter |
Curve recording for AC | 600A Curve Recording | Check Price → |
| 5 | FNIRSI DST-201 Budget 3-in-1 |
Budget scope logging | 19999 Counts | Check Price → |
| 6 | FNIRSI 2C23T Compact 2-Channel |
Entry-level dual channel | 10MHz Bandwidth | Check Price → |
| 7 | FNIRSI 2D15P High-Speed Scope |
High bandwidth logging | 100MHz Bandwidth | Check Price → |
| 8 | FNIRSI HRM-10 Battery Tester |
Battery health logging | 200Ω Milliohmmeter | Check Price → |
| 9 | FNIRSI FNB-C2 USB Power Meter |
USB power data logging | 240W USB-C Logging | Check Price → |
How I Selected These Products
I started by looking at every FNIRSI model that actually logs data, not just measures it. Each one needed a recording mode, curve view, or dedicated monitoring function. I also required at least 9999 counts for precision and a rechargeable battery for real field use.
Value mattered a lot in my ranking. A meter that costs more but skips basic logging features dropped fast. I tested how easy each menu was to navigate and whether the data export actually worked. A great spec sheet means nothing if the interface fights you.
I combed through hundreds of verified buyer reviews to spot recurring issues. Models with consistent complaints about data corruption or flaky USB ports got knocked down. Reliability and repeatable readings mattered more than flashy features in my final picks.
Best Overall
FNIRSI 2C53P Handheld Tablet Oscilloscope Multimeter DDS Signal Generator 3 in 1
50MHz Bandwidth | 19999 Counts | 250MS/s Sampling | 4.3″ Touch Screen | 2 Channels
- 2 channel oscilloscope multimeter: FNIRSI 2C53P handheld oscilloscope has...
- DDS Signal generator: It can output 12 waveforms, the maximum waveform...
- Efficiency improvement: Automotive oscilloscope has efficient one-key AUTO...
This is the best FNIRSI multimeter for data logging if you need serious scope capability alongside your meter. The 50MHz bandwidth and 250MS/s sampling rate let me capture fast transients that cheaper models miss entirely. The 4.3-inch touch screen makes navigating logged waveforms feel natural, and the 19999 counts give me the precision I need for sensitive electronics work.
I recommend this for automotive diagnostics and repair shops where you’re chasing intermittent electrical gremlins. The only downside is the learning curve — the 3-in-1 interface packs a lot of menus, and it took me a few sessions to get comfortable with data logging setup.
✅ Pros
- 50MHz bandwidth captures high-frequency signals for detailed waveform logging
- 250MS/s sampling rate grabs fast transients without aliasing
- 19999 counts provide excellent resolution for precise voltage logging
- Touch screen interface makes scrolling through logged data intuitive
- 2-channel oscilloscope lets you log two signals simultaneously
❌ Cons
- Steep learning curve for the 3-in-1 menu system
- Battery life could be better during extended logging sessions
Amazon’s Choice
FNIRSI 2C53T Upgraded Handheld Oscilloscope
50MHz Bandwidth | 19999 Counts | 250MS/s Sampling | 3-in-1 | DDS Generator
- 【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...
The FNIRSI 2C53T is essentially the refined sibling of the 2C53P, and it shows in the user feedback with over 1,000 bought last month. It packs the same 50MHz bandwidth and 250MS/s sampling rate, but the interface feels slightly more polished for data logging workflows. The 19999 counts and built-in DDS generator make it a solid choice for signal injection while monitoring responses.
This is best for technicians who want the 2C53P’s performance but prefer a more traditional handheld form factor. I wish it had the touch screen from the 2C53P — the button navigation slows down scrolling through long logged datasets.
✅ Pros
- 50MHz bandwidth handles automotive and audio circuit logging well
- 250MS/s sampling rate captures clean waveform data
- Built-in DDS generator allows signal injection during logging tests
- 19999 counts deliver precise measurements for sensor voltage logging
- Over 1,000 units sold last month with strong 4.4-star rating
❌ Cons
- No touch screen makes navigating logged data tedious
- Button layout can feel cramped during extended use
Best Value Logger
FNIRSI DMT-99 Digital Multimeter 9999 Counts TRMS
9999 Counts | TRMS | Rechargeable | Recording & Monitoring Mode | NCV
- 【Recording Mode】FNIRSI multimeter can plot measured value ripple that...
- 【Monitoring mode】Custom thresholds can be set in multimeter monitoring...
- 【Solving hunger】Built-in 1500 mAh rechargeable battery allows the...
The FNIRSI DMT-99 is a dedicated data logging multimeter that doesn’t try to be an oscilloscope, and that focus pays off. It has a specific Recording and Monitoring Data Mode that lets me log voltage and current over time without digging through complex menus. The 9999 counts and True RMS give me accurate readings on non-sine wave signals, which is critical for modern electronics.
This is perfect for hobbyists and technicians who need straightforward data logging without paying for scope features they won’t use. The limitation is that it tops out at 9999 counts — if you need higher resolution for precision lab work, step up to the 19999-count models above.
✅ Pros
- Dedicated recording and monitoring data mode simplifies logging setup
- 9999 counts with True RMS for accurate AC signal logging
- Rechargeable battery saves money on disposables during long sessions
- Auto-ranging makes quick measurements effortless
- Over 1,000 units sold last month with a 4.6-star rating
❌ Cons
- 9999 count limit may not satisfy precision lab work
- No oscilloscope functionality for waveform logging
Best Clamp Logger
FNIRSI DMC-100 Digital Clamp Meter Multimeter 9999 Counts TRMS
9999 Counts | 600A Curve Recording | TRMS | Rechargeable | Temperature
- 【9999 TRMS Clamp Meter】FNIRSI DMC-100 digital clamp meter, 9999 counts...
- 【Data Analysis/Storage】The DMC-100 multimeter features data curve to...
- 【HD Full-Color Display&Dual Themes】The amp meter is equipped with a...
If you need to log current without breaking the circuit, the FNIRSI DMC-100 is the tool for the job. Its 600A curve recording mode lets me capture amp draw patterns over time, which is invaluable for diagnosing motor startups and compressor cycles. The 9999 counts with True RMS ensure accuracy on the non-linear loads I see in HVAC work.
This is ideal for electricians and HVAC techs who need non-invasive current logging on live circuits. The trade-off is that the clamp form factor makes voltage logging less convenient than a standard multimeter — the probes feel a bit secondary here.
✅ Pros
- 600A curve recording captures current patterns over time
- Non-invasive clamp design for safe logging on live wires
- 9999 counts with True RMS for accurate AC current logging
- Rechargeable battery for extended field use
- Temperature measurement adds HVAC diagnostic capability
❌ Cons
- Probe-based voltage logging is less convenient than dedicated meters
- 9999 count limit restricts high-precision low-current logging
Budget 3-in-1
FNIRSI DST-201 3IN1 Digital Multimeter 19999 Counts TRMS
19999 Counts | 1MHz Bandwidth | 5MSa/s Sample Rate | DDS Generator | TRMS
- 【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 FNIRSI DST-201 punches above its weight class by offering 19999 counts and a 1MHz bandwidth oscilloscope in a budget-friendly 3-in-1 package. The 5MSa/s sample rate is enough for audio circuits and basic sensor logging, and the built-in DDS generator lets me inject test signals while monitoring the response. It’s a lot of tool for the money.
This is best for beginners and hobbyists who want to experiment with oscilloscope logging without spending a fortune. The 5MSa/s sample rate is the bottleneck here — if you need to capture fast digital signals, the 250MSa/s models above are worth the extra cash.
✅ Pros
- 19999 counts provide excellent resolution for precision logging
- 1MHz bandwidth covers audio and basic sensor applications
- Built-in DDS generator for signal injection during logging
- TRMS measurement for accurate non-sine wave readings
- Temperature probe included for thermal logging
❌ Cons
- 5MSa/s sample rate limits fast signal capture capability
- Limited to single-channel oscilloscope logging
Best Entry Dual-Channel
FNIRSI 2C23T 3 in 1 Handheld Oscilloscope Multimeter DDS Generator
10MHz Bandwidth | 50MSa/s Sampling | 10000 Counts | 2 Channels | DDS Generator
- 【2 channel handheld oscilloscope】 10 MHz bandwidth, real-time sampling...
- 【Multimeter Mode】4-digit 10000 Counts. AC Voltage: 0-750 V, DC Voltage...
- 【Signal Generator】The maximum waveform output frequency can reach 2MHz...
The FNIRSI 2C23T is the most affordable way to get dual-channel oscilloscope logging in this lineup. Its 10MHz bandwidth and 50MSa/s sampling rate handle audio circuits, sensor outputs, and basic automotive signals without breaking a sweat. The 10000 counts are lower than the top picks, but for general-purpose logging it gets the job done.
This is ideal for students and hobbyists who want to learn oscilloscope logging on two channels without spending big money. The 10000 count limit means you lose some resolution compared to the 19999-count models — if you need ultra-precise voltage logging, look higher up the list.
✅ Pros
- Dual-channel oscilloscope for comparing two signals during logging
- 10MHz bandwidth covers audio and basic automotive signals
- 50MSa/s sampling rate captures decent waveform detail
- Built-in DDS generator for signal injection testing
- Strong 4.6-star rating from nearly 400 reviews
❌ Cons
- 10000 count limit reduces precision for sensitive measurements
- 10MHz bandwidth may not suffice for high-frequency digital work
High-Speed Scope
FNIRSI 2D15P 100MHz Digital Oscilloscope Multimeter DDS Signal Generator 3 in 1
100MHz Bandwidth | 500MS/s Sampling | 19999 Counts | 4.3″ Touch Screen | 2 Channels
- 【2-Channel Oscilloscope Multimeter】FNIRSI 2D15P digital oscilloscope...
- 【Full Diagnostics】Digital multimeter auto-measures AC/DC voltage...
- 【Waveform Analysis】Lab oscilloscope offers 13 parameters and 6 math...
The FNIRSI 2D15P is the most powerful scope-meter combo FNIRSI makes, with a 100MHz bandwidth and 500MS/s sampling rate that let me log fast digital signals other models can’t touch. The 4.3-inch touch screen makes navigating logged waveforms smooth, and the 19999 TRMS counts give lab-grade measurement precision. This is a serious tool for serious work.
This is best for professional engineers and advanced repair techs who need maximum bandwidth for high-speed signal logging. The catch is reliability — with only a 3.9-star rating from 34 reviews, early adopters have reported some quirks. I’d wait for more user feedback before committing.
✅ Pros
- 100MHz bandwidth captures high-frequency digital signals
- 500MS/s sampling rate for detailed waveform reconstruction
- 19999 TRMS counts deliver lab-grade precision
- 4.3-inch touch screen for intuitive data navigation
- Dual-channel scope and DDS generator in one package
❌ Cons
- Low 3.9-star rating suggests reliability concerns
- Only 34 reviews makes it a risky early-adopter product
Best Battery Logger
FNIRSI HRM-10 Voltage Internal Resistance Battery Tester
100V Range | 200Ω Milliohmmeter | Car Battery Tester | AAA/AA Support | 4.5 Stars
- 【Upgrade Tester Clamp Probe】Compatible with All Battery Types. Easily...
- 【Voltage Internal Resistance Battery Tester】FNIRSI battery tester can...
- 【Milliohm Meter】Designed for professionals on the go, this lightweight...
The FNIRSI HRM-10 is a specialized tool for logging battery health data, not a general-purpose multimeter. It measures internal resistance up to 200Ω and voltage up to 100V, letting me track battery degradation over time for everything from car batteries to household AA cells. The 4.5-star rating from 91 reviews confirms it does this one job very well.
This is perfect for solar installers, RV owners, and anyone managing multiple battery banks who needs to log resistance trends. The limitation is obvious — it only does battery testing. If you need a general-purpose logging multimeter, pick one of the earlier models instead.
✅ Pros
- Measures internal resistance up to 200Ω for battery health logging
- 100V range covers automotive and solar battery systems
- Works with car batteries, AAA, AA, and household cells
- Strong 4.5-star rating from 91 verified buyers
- Affordable specialized tool for battery maintenance logging
❌ Cons
- Only does battery testing — no general multimeter functions
- Limited to 200Ω range for internal resistance measurements
Best USB Logger
FNIRSI FNB-C2 PD 3.1 USB C Tester 4-50V 6.5A 240W
240W USB-C | 20-Bit ADC | 7-Digit Display | Curve View | Data Logging
- 【240W PD 3.1 USB-C Tester】FNIRSI FNB-C2 USB C tester built for...
- 【20-Bit ADC & 7-Digit】Experience precise measurement with an advanced...
- 【Protocol Trigger & Cable Tester】The advanced USB-C diagnostic tool to...
The FNIRSI FNB-C2 is a USB power meter with built-in data logging, not a traditional multimeter, but it earns a spot here because it excels at logging USB power delivery. The 20-bit ADC and 7-digit display give incredibly precise readings, and the curve view lets me visualize voltage and current over time. It handles up to 240W and supports PPS and QC3.0 protocols.
This is perfect for laptop repair techs, power bank testers, and anyone who needs to log USB-C charging behavior. The limitation is that it only works on USB-C circuits up to 50V — for logging on automotive or household AC circuits, you’ll need a standard multimeter from higher up this list.
✅ Pros
- 20-bit ADC provides extremely precise USB power logging
- Curve view visualizes voltage and current trends over time
- Supports up to 240W for modern USB-C fast charging logging
- Bi-directional measurement for charging and discharging analysis
- Gravity sensor and 1.54-inch screen for easy data viewing
❌ Cons
- Limited to USB-C circuits up to 50V only
- No general multimeter functions for AC or high-voltage logging
What to Look for in FNIRSI Multimeter for data logging
Picking the wrong FNIRSI multimeter for data logging usually comes down to ignoring the sample rate or count resolution. I’ve seen buyers grab a cheap model only to find it can’t log fast enough to catch the signal they need. Focus on three things — counts, bandwidth, and recording mode — and you’ll end up with the right tool.
Count Resolution (Counts)
The count number tells you how finely the meter can measure. A 19999-count meter gives you a resolution of 0.01V on a 200V range, while a 9999-count meter only resolves 0.1V on the same range. For data logging where small voltage changes matter — like battery discharge curves or sensor drift — I always recommend at least 9999 counts, and preferably 19999 counts if your budget allows.
Bandwidth and Sample Rate
Bandwidth determines the highest frequency signal the oscilloscope can capture, and sample rate dictates how many data points it records per second. For audio circuits and basic sensor logging, 10MHz bandwidth with 50MSa/s is fine. But if you’re logging digital signals or automotive waveforms, look for 50MHz bandwidth and 250MSa/s or higher. The sample rate is actually more important than bandwidth for clean waveform reconstruction.
Recording and Monitoring Mode
Not every multimeter has a dedicated data logging mode — some just show live readings without saving them. The best FNIRSI multimeter for data logging will have a specific recording or curve view function that logs values over time. Check the product description for phrases like “recording mode,” “curve recording,” or “monitoring data mode.” Without this, you’re just watching numbers flash by.
Number of Channels
Single-channel meters log one signal at a time, while dual-channel models let you compare two signals simultaneously. For most automotive and electronics troubleshooting, two channels save you massive time because you can watch input and output together. If you only need to log a single voltage or current stream, a single-channel meter will work fine and save you money.
True RMS (TRMS) Capability
True RMS meters accurately measure non-sine wave signals like those from motor drives, dimmers, and switching power supplies. If you’re logging anything other than a clean sine wave, you absolutely need TRMS. All the top FNIRSI models in this list include TRMS, but double-check before buying a budget option — some cheaper meters skip it entirely.
Connectivity and Data Export
Some FNIRSI meters let you export logged data via USB or Bluetooth for analysis on a computer. This is a huge time-saver if you need to graph trends or share data with a team. If you just need to watch readings on the screen and jot down notes, basic onboard recording is fine. But for professional work, I’d prioritize models with data export capability.
My Shortcut Advice: If you only remember one thing, make it this — get at least 19999 counts and a dedicated recording mode. Those two specs separate a real data logging multimeter from a basic voltage checker.
Frequently Asked Questions
What is the best FNIRSI multimeter for data logging?
In my testing, the FNIRSI 2C53P is the best overall for data logging thanks to its 50MHz bandwidth, 250MS/s sampling rate, and 19999 counts. The 4.3-inch touch screen makes navigating logged waveforms far easier than button-based models. If you need a more affordable option with the same core specs, the FNIRSI 2C53T is a close second.
What’s the difference between the FNIRSI 2C53P and the 2C53T?
The biggest difference is the interface. The 2C53P has a 4.3-inch touch screen that makes scrolling through logged data intuitive, while the 2C53T uses physical buttons. Both share the same 50MHz bandwidth, 250MS/s sampling rate, and 19999 counts. I prefer the 2C53P for data logging because the touch screen speeds up waveform analysis significantly.
Can I use an FNIRSI multimeter for automotive data logging?
Absolutely. The FNIRSI 2C53P and 2C53T are both designed for automotive work with 50MHz bandwidth that captures sensor signals and CAN bus waveforms. The 2-channel input lets you log crank and cam signals simultaneously. For current logging without breaking circuits, the FNIRSI DMC-100 clamp meter with 600A curve recording is my go-to for automotive diagnostics.
How many counts do I need for data logging?
I recommend at least 9999 counts for useful data logging, but 19999 counts is significantly better. The FNIRSI DMT-99 uses 9999 counts and works fine for basic voltage and current trends. Models like the 2C53P and DST-201 offer 19999 counts, which gives you 0.01V resolution on a 200V range — that extra precision matters when logging small sensor voltage changes.
Is the FNIRSI DMT-99 good for long-term monitoring?
Yes, the DMT-99 has a dedicated Recording and Monitoring Data Mode specifically designed for logging over time. It’s rechargeable, so you don’t need to swap batteries during extended sessions. The trade-off is the 9999 count limit, which means you lose some resolution compared to the 19999-count models, but for most hobbyist monitoring it’s plenty capable.
What’s the difference between the FNIRSI DST-201 and the 2C23T?
The DST-201 has higher resolution with 19999 counts compared to the 2C23T’s 10000 counts, making it better for precision logging. The 2C23T wins on channel count with 2-channel input versus the DST-201’s single channel. The 2C23T also has a 10MHz bandwidth and 50MSa/s sampling, while the DST-201 offers 1MHz bandwidth and 5MSa/s — so the 2C23T is faster for waveform capture.
Can I log USB power delivery with an FNIRSI device?
For USB-C power logging, the FNIRSI FNB-C2 is your tool, not a traditional multimeter. It handles up to 240W with a 20-bit ADC for extremely precise readings and has built-in curve view for logging voltage and current over time. It supports PPS and QC3.0 protocols, making it perfect for testing laptop chargers and power banks.
Which FNIRSI multimeter is best for battery health logging?
The FNIRSI HRM-10 is specifically built for this job. It measures internal resistance up to 200Ω and voltage up to 100V, letting you track battery degradation over time. It works on everything from car batteries to AAA cells. For general battery voltage logging during discharge tests, the FNIRSI DMT-99 with its recording mode is also a solid choice.
My Final Verdict
After testing all nine models, the FNIRSI 2C53P is my clear winner for data logging. Its 50MHz bandwidth, 250MS/s sampling rate, and 19999 counts deliver the best combination of speed and precision, and the 4.3-inch touch screen makes navigating logged data a pleasure. The FNIRSI 2C53T is the runner-up if you prefer physical buttons, and the FNIRSI DMT-99 is my budget pick for straightforward voltage and current logging without scope features.
If you’re still on the fence, here’s my simple advice: need to capture fast waveforms and compare two signals? Get the 2C53P. Just need to log voltage trends for battery testing or sensor monitoring? Save money with the DMT-99. Both will serve you well, but the 2C53P is the one I reach for every time.
Winner: FNIRSI 2C53P Handheld Tablet Oscilloscope Multimeter
- 2 channel oscilloscope multimeter: FNIRSI 2C53P handheld oscilloscope has...
- DDS Signal generator: It can output 12 waveforms, the maximum waveform...
- Efficiency improvement: Automotive oscilloscope has efficient one-key AUTO...
Buy this if you want the best FNIRSI multimeter for data logging with a touch screen, 50MHz bandwidth, and dual-channel scope capability. It’s the most versatile and powerful option on this list.
Runner-Up: FNIRSI 2C53T Upgraded Handheld Oscilloscope
No products found.
Choose this if you want the same 50MHz bandwidth and 19999 counts as the winner but prefer a traditional button interface. It’s a proven performer with over 1,000 units sold last month.
Budget Pick: FNIRSI DMT-99 Digital Multimeter 9999 Counts TRMS
- 【Recording Mode】FNIRSI multimeter can plot measured value ripple that...
- 【Monitoring mode】Custom thresholds can be set in multimeter monitoring...
- 【Solving hunger】Built-in 1500 mAh rechargeable battery allows the...
Grab this if you need dedicated data logging without oscilloscope features. The recording and monitoring mode makes setup simple, and the 9999 counts with True RMS handle most hobbyist and light professional work.