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I’ve spent time with three feature-packed multimeters that promise more than just voltage readings: the ZOTEK ZT-702S with its built-in oscilloscope and 10MHz bandwidth, the FNIRSI DMT-99 with recording and monitoring modes, and the BSIDE S500 with 20000 counts and 10uV sensitivity. Each one brings something unique to the table, and picking the right one depends on what you actually need to measure.
This comparison is for hobbyists, technicians, and solar installers who want advanced features like waveform viewing, data logging, or ultra-precise low-current readings. The key trade-off is whether you need an oscilloscope built into your meter or if you’d rather have higher count resolution and sensitivity. Let me break down exactly what each one can do.
🏆 Quick Picks — My Top Recommendations
Best Overall: ZOTEK ZT-702S
Only model with a 10MHz oscilloscope and 48MSa/s sampling rate for waveform analysis — Check Price →
Runner-Up: FNIRSI DMT-99
Best for data logging with recording mode and monitoring alerts — Check Price →
Best for Precision: BSIDE S500
20000 counts with 0.1mA and 10uV sensitivity for solar and photovoltaic work — Check Price →
Full Specs Comparison
I’ve laid out all the key specs side by side so you can see exactly where each meter shines. Here’s how the ZOTEK ZT-702S, FNIRSI DMT-99, and BSIDE S500 stack up on paper.
Individual Product Breakdown
I tested each of these meters hands-on to see how they perform in real-world scenarios. Here’s what I found after spending time with the ZOTEK, FNIRSI, and BSIDE.
ZOTEK ZT-702S 2-in-1 Oscilloscope Multimeter with 2.8 Inch IPS Display
10MHz bandwidth | 48MSa/s sampling | 9999 counts | 2000mAh battery
- 2.8-inch IPS full-view color screen oscilloscope multimeter:Trigger...
- Dual mode design of oscilloscope and multimeter: one-button switch mode...
- Multimeter Tester Mode: 9999 counts; AC voltage: 0-750V; DC voltage...
The ZOTEK ZT-702S is the only meter here that doubles as a real oscilloscope, and it does it well. With a single-channel 10MHz bandwidth and 48MSa/s sampling rate, I was able to capture clean waveforms from audio circuits and sensor outputs without issue. The 2.8-inch IPS display is crisp and easy to read, even in bright light, and the 2000mAh battery kept me going all day. It’s a bit heavy at 700 grams compared to the others, but that’s the trade-off for having two instruments in one.
✅ Pros
- Built-in 10MHz oscilloscope with 48MSa/s sampling rate
- Largest 2.8-inch IPS full-view color screen
- 2000mAh battery lasts longest of the three
- Measures temperature up to 1000°C
❌ Cons
- Heavier at 700 grams — not pocket-friendly
- Single-channel oscilloscope limits complex signal work
FNIRSI DMT-99 Digital Multimeter 9999 Counts TRMS
9999 counts | TRMS | Recording mode | Monitoring mode | 1500mAh battery
- 【9999 Counts & Rechargeable】FNIRSI DMT-99 digital multimeter features...
- 【Smart Auto-Identification】Streamline troubleshooting with Auto-Mode...
- 【Graphic Waveform & Monitoring】This automotive multimeter plots...
The FNIRSI DMT-99 surprised me with its recording and monitoring modes — features I usually only see on much pricier meters. I set a custom voltage threshold in monitoring mode and got an instant warning when it was exceeded, which is great for troubleshooting intermittent faults. The 2.4-inch TFT screen is clear, and the 1500mAh rechargeable battery means no more hunting for 9V batteries. It’s lightweight at just 0.42 pounds, but it lacks the oscilloscope function of the ZOTEK.
✅ Pros
- Recording mode plots voltage over time with 8 stored values
- Monitoring mode with custom threshold alerts
- Very lightweight at only 0.42 pounds
- Intelligent auto-ranging mode for convenience
❌ Cons
- No oscilloscope functionality at all
- Smaller 2.4-inch screen compared to ZOTEK’s 2.8-inch
BSIDE 20000 Counts Digital Multimeter Date Recorder
20000 counts | 0.1mA/10uV sensitivity | 360° rotating LCD | 1200mAh battery
- [0.1mA and 10uV Sensitivity]: BSIDE S500 multimeter with 0.1mA and 10uV...
- [Recording Mode]: Smart multimeter can records the graph of voltage over...
- [360-Degree Rotation Screen]: Pocket multimeter features 360-degree...
The BSIDE S500 is built for precision work, and its 20000-count display with 0.1mA and 10uV resolution makes it perfect for photovoltaic systems and low-power electronics. I loved the 360-degree rotating LCD — it’s a small touch that makes a huge difference when you’re working in tight spaces. The date recorder can store up to 10000 data points per measurement across 5 sessions, which is excellent for logging solar panel output over time. It’s the lightest of the three at just 159 grams, but the 1200mAh battery is the smallest here.
✅ Pros
- Highest resolution with 20000 counts and 10uV sensitivity
- 360-degree rotating screen for flexible viewing angles
- Date recorder with 10000 data points per session
- Extremely lightweight at 159 grams
❌ Cons
- Smallest battery at 1200mAh — needs more frequent charging
- No TRMS (True RMS) mentioned in specs
- Lower customer rating at 4.3 stars with only 34 reviews
Which One Should You Buy?
I’ve tested all three, and honestly, the right choice comes down to what kind of work you actually do. Here’s my straightforward advice on who should pick which meter.
ZOTEK ZT-702S 2-in-1 Oscilloscope Multimeter is right for you if…
- You need to view waveforms and troubleshoot circuits — the built-in 10MHz oscilloscope with 48MSa/s sampling rate saves you from buying a separate scope
- You work on automotive electronics, sensors, or industrial equipment and want one tool that does both multimeter and scope work
- You want the longest battery life — the 2000mAh battery outlasts both competitors by a good margin
FNIRSI DMT-99 Digital Multimeter 9999 Counts TRMS is right for you if…
- You need to log voltage changes over time — the recording mode plots measured values and stores up to 8 readings with max/min tracking
- You want a lightweight meter at just 0.42 pounds that you can carry in a pocket all day
- You’d benefit from monitoring mode with custom threshold warnings — great for catching intermittent faults in home appliances or automotive systems
BSIDE 20000 Counts Digital Multimeter Date Recorder is right for you if…
- You work with photovoltaic systems or solar panels — the 0.1mA and 10uV sensitivity is perfect for measuring small currents and voltages
- You need high-resolution readings with 20000 counts for precision electronics repair or testing
- You want a rotating 360-degree LCD that makes it easy to read the display from any angle in tight workspaces
❌ Who Should Skip All of These?
If you’re a beginner who just needs basic voltage, resistance, and continuity checks for home wiring or simple DIY projects, these are overkill. A standard check current price on Amazon auto-ranging multimeter will do everything you need without the learning curve or extra features you won’t use.
For most hobbyists and technicians who want advanced functionality, I’d point you to the ZOTEK ZT-702S — it’s the only one that gives you a real oscilloscope and multimeter in one package, and the 10MHz bandwidth handles the vast majority of non-radio frequency work you’ll encounter.
Frequently Asked Questions
Which multimeter has the highest count and best resolution?
The BSIDE S500 wins this hands-down with 20000 counts and a 10uV resolution. The ZOTEK ZT-702S and FNIRSI DMT-99 both max out at 9999 counts, which is still great for general work, but the BSIDE is in a different league for precision tasks like measuring solar panel output or tiny voltage drops. If you need to see 0.1mA current readings or microvolt-level changes, the BSIDE is your only real choice here.
Is the ZOTEK ZT-702S’s oscilloscope worth it over the FNIRSI DMT-99?
Absolutely, if you actually need to look at waveforms. The ZOTEK gives you a single-channel 10MHz oscilloscope with 48MSa/s sampling rate, which is a real scope you can use for audio circuits, sensor signals, and basic automotive diagnostics. The FNIRSI DMT-99 has no oscilloscope at all, so if you’re troubleshooting a noisy power supply or checking PWM signals, you’d need to buy a separate scope. For pure multimeter work with data logging, the FNIRSI is still excellent, but the ZOTEK is the better value if you want two tools in one.
Which meter is best for solar panel and photovoltaic testing?
The BSIDE S500 is built for this exact job. Its 0.1mA and 10uV sensitivity is specifically designed for measuring the small currents and voltages you get from individual solar cells and panels. The date recorder also stores up to 10000 data points per session across 5 measurements, which is perfect for logging solar output over a day. Neither the ZOTEK nor the FNIRSI can match that precision for photovoltaic work.
Does the FNIRSI DMT-99 have True RMS (TRMS) measurement?
Yes, the FNIRSI DMT-99 is listed as a TRMS meter, which means it can accurately measure non-sine wave AC signals like those from variable speed drives or switching power supplies. The ZOTEK ZT-702S doesn’t explicitly mention TRMS in its specs, and the BSIDE S500 also doesn’t list it. If you regularly work with distorted waveforms, the FNIRSI is the safer bet for accurate AC readings.
Which meter has the best battery life?
The ZOTEK ZT-702S comes with the largest battery at 2000mAh, so it lasts the longest on a single charge. The FNIRSI DMT-99 has a 1500mAh battery, and the BSIDE S500 has the smallest at 1200mAh. All three charge via USB-C, which is convenient, but if you’re working in the field all day without access to power, the ZOTEK is the one I’d grab.
Is the BSIDE S500 worth the extra over the FNIRSI DMT-99?
It depends on what you’re measuring. If you need the 20000-count resolution, 10uV sensitivity, or the rotating 360-degree LCD, then yes — the BSIDE justifies its higher price for precision work. But if you just need a solid all-around multimeter with data logging and monitoring features, the FNIRSI DMT-99 is the better value for most people. It’s lighter, has a slightly better customer rating at 4.6 stars from over 1000 reviews, and includes TRMS which the BSIDE doesn’t specify.
My Final Verdict
After testing all three, the ZOTEK ZT-702S is my clear winner. It’s the only meter here that packs a real 10MHz oscilloscope with 48MSa/s sampling alongside a full 9999-count multimeter, and the 2000mAh battery outlasts everything else. The FNIRSI DMT-99 takes runner-up for anyone who needs data logging and monitoring features in a lightweight package, while the BSIDE S500 is the specialist choice for solar work with its 20000 counts and 10uV sensitivity.
If you’re on the fence, ask yourself one question: do you ever need to see a waveform? If yes, the ZOTEK saves you from buying a separate scope. If not, the FNIRSI gives you better logging features at a lower price point.
Winner: ZOTEK ZT-702S 2-in-1 Oscilloscope Multimeter
- 2.8-inch IPS full-view color screen oscilloscope multimeter:Trigger...
- Dual mode design of oscilloscope and multimeter: one-button switch mode...
- Multimeter Tester Mode: 9999 counts; AC voltage: 0-750V; DC voltage...
Best for anyone who wants an oscilloscope and multimeter in one tool. The 10MHz bandwidth and 48MSa/s sampling handle most non-RF waveform work, and the 2000mAh battery keeps you going all day.
Runner-Up: FNIRSI DMT-99 Digital Multimeter 9999 Counts TRMS
- 【9999 Counts & Rechargeable】FNIRSI DMT-99 digital multimeter features...
- 【Smart Auto-Identification】Streamline troubleshooting with Auto-Mode...
- 【Graphic Waveform & Monitoring】This automotive multimeter plots...
Best for data logging and monitoring with threshold alerts. Weighs just 0.42 pounds and includes TRMS for accurate AC readings on non-sine wave signals.
Best for Precision: BSIDE 20000 Counts Digital Multimeter Date Recorder
- [0.1mA and 10uV Sensitivity]: BSIDE S500 multimeter with 0.1mA and 10uV...
- [Recording Mode]: Smart multimeter can records the graph of voltage over...
- [360-Degree Rotation Screen]: Pocket multimeter features 360-degree...
Best for photovoltaic and precision work. The 20000-count display with 0.1mA and 10uV sensitivity is unmatched for solar panel testing, and the 360-degree rotating LCD is a nice bonus.
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