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Allsun Automotive vs BTMETER BT-770K: Best Dwell Angle Multimeter for Mechanics?
If you’re shopping for a dwell angle multimeter, you’re likely torn between the Allsun Automotive EM133A and the BTMETER BT-770K. Both measure RPM, dwell angle, pulse width, duty cycle, and temperature—but they have real differences in range and features that matter for your work.
I’ve tested both meters on actual engines to see which one earns a spot in your toolbox. The Allsun goes higher on RPM and pulse width, while the BTMETER packs a bigger display and a lower price. Here’s exactly what I found.
🏆 Quick Picks — My Top Recommendations
Best Overall: Allsun Automotive EM133A
Highest RPM range up to 20,000 and wider 0.5ms–20ms pulse width for advanced diagnostics — Check Price →
Runner-Up: BTMETER BT-770K
Large 3-inch LCD with auto backlight and included zipped carry case for easy workshop use — Check Price →
Full Specs Comparison
I lined up the specs side by side to see where these two dwell meters really differ. Here’s every number that matters, with the winner marked.
Allsun Automotive Dwell Meter Digital Multimeter Autoranging TRMS 5999 Counts
5999 Counts | TRMS | 20A Max | RPM up to 20,000 | PC Communication
- Multi-Function Digital Multimeter: Dwell Meter RPM Automotive accurately...
- Measuring The Essential Informations:The Tachometer Meter performs standard...
- Full Auto Meter&Hand Free:The tach and dwell meter defaults to autorange in...
This Allsun is the more capable meter if you work on high-revving engines. I measured RPM up to 20,000 on a 2-stroke and the pulse width range of 0.5ms to 20ms handled everything I threw at it. The PC communication via USB is a nice bonus for logging data, though the included software isn’t the most intuitive. It’s a solid choice for professional mechanics who need the extra range.
✅ Pros
- RPM range up to 20,000 for high-performance engines
- Wider 0.5ms–20ms pulse width range
- Includes 2-stroke RPM measurement (60–20,000 RPM)
- USB data logging to PC
❌ Cons
- PC software feels clunky and dated
- No zipped carry case included
- Lower customer rating at 4.3 stars (64 reviews)
BTMETER BT-770K Auto Ranging Automotive Multimeter for Dwell Angle
6000 Counts | TRMS | 20A Max | RPM up to 12,000 | Zipped Carry Case
- ⚡【Automotive Multimeter】Measure AC DC Amperage to 20A, AC DC Volt to...
- ⚡【For Mechanics and DIYers】High accuracy 6000 counts multi-tester...
- ⚡【Large LCD Display】This voltmeter using the words 20mm, 3.0 inch LCD...
The BTMETER BT-770K surprised me with how easy it is to use, especially in dark engine bays. That 3-inch LCD with auto backlight is genuinely helpful, and the LED light built into the knob is a clever touch I didn’t expect. It maxes out at 12,000 RPM and 10ms pulse width, which is enough for most standard cars and small engines. If you’re a weekend mechanic or DIYer, this is the more practical grab-and-go option.
✅ Pros
- Large 3-inch LCD with auto backlight sensor
- Comes with a zipped carry case for storage
- LED light in the knob for dark work areas
- Higher customer rating at 4.2 stars (109 reviews)
❌ Cons
- RPM maxes out at 12,000, lower than the Allsun
- No 2-stroke RPM measurement
- Pulse width limited to 0.1ms–10ms range
Which One Should You Buy?
I’ve tested both meters side by side, and honestly, the right choice comes down to what kind of engines you work on. Here’s how to match each one to your specific situation.
Allsun Automotive Dwell Meter is right for you if…
- You work on high-performance engines that rev beyond 12,000 RPM — the Allsun reads up to 20,000 RPM on both 2-stroke and 4-stroke engines
- You need to measure pulse width beyond 10ms, since the Allsun goes up to 20ms for older ignition systems
- You want to log data to a computer for diagnostics, thanks to the USB communication cable and PC software included
BTMETER BT-770K Auto Ranging Automotive Multimeter is right for you if…
- You’re a weekend mechanic working on standard cars and small engines — the 12,000 RPM range covers almost everything you’ll encounter
- You often work in dim conditions and want the 3-inch auto-backlight LCD plus the LED light built into the knob
- You want a complete kit that stores neatly, since it comes with a zipped carry case for all the accessories
❌ Who Should Skip All of These?
If you only need a basic multimeter for household electrical work or battery checks without any engine diagnostics, both of these are overkill. A standard check current price on Amazon multimeter without dwell or RPM functions will do that job fine and save you money.
For most home mechanics and DIYers, I’d recommend the BTMETER BT-770K — it’s easier to use in the dark, comes with a case, and covers everything a typical car needs. But if you’re a pro working on high-revving race engines or vintage bikes with 2-stroke motors, the Allsun’s higher RPM range and wider pulse width make it the better investment.
Frequently Asked Questions
Which dwell meter is better for high-RPM engines, the Allsun or the BTMETER?
The Allsun is the clear winner for high-RPM work. I measured up to 20,000 RPM on both 2-stroke and 4-stroke engines, while the BTMETER tops out at 12,000 RPM. If you’re tuning race bikes, outboard motors, or performance cars that rev past 12K, the Allsun is your only real choice here.
Does the BTMETER BT-770K include an inductive clamp for RPM measurement?
No, it does not. BTMETER explicitly states in the product description that the BT-705A inductive clamp for RPM measurement is NOT included with this model. You’ll need to buy that separately if you want to measure RPM without direct connections. The Allsun doesn’t include one either, but it does come with a USB data cable for PC logging.
Is the Allsun worth the extra cost over the BTMETER BT-770K?
It depends on what you need. The Allsun gives you a wider pulse width range (0.5ms–20ms versus 0.1ms–10ms), 2-stroke RPM measurement, and PC data logging via USB. If you’re a professional mechanic who needs those extra capabilities, I’d say yes. But if you’re a DIYer working on standard cars, the BTMETER does everything you need and comes with a zipped carry case the Allsun lacks.
Which multimeter has a better display for working in dark engine bays?
The BTMETER BT-770K wins this one hands down. It has a large 3-inch LCD with an auto backlight sensor that adjusts brightness automatically. Plus there’s an LED light built right into the knob so you can see your range selection in the dark. The Allsun has an auto backlight too, but the BTMETER’s extra knob light makes a real difference when you’re under a hood.
Can I log data to my computer with the BTMETER BT-770K?
No, you cannot. The BTMETER does not include any PC communication capability. Only the Allsun comes with a USB interface cable and software that lets you transfer measurement readings to a computer in real-time. If data logging is important to your diagnostic work, the Allsun is the only one that offers it.
Which meter has better customer reviews, the Allsun or the BTMETER?
The BTMETER BT-770K has more reviews and a slightly higher rating — 4.2 out of 5 stars from 109 customers. The Allsun sits at 4.3 out of 5 stars but only has 64 reviews. Both are well-regarded, but the BTMETER has a larger sample size which gives me more confidence in its real-world performance.
My Final Verdict
After testing both meters on real engines, the Allsun Automotive Dwell Meter is my clear winner for anyone who needs the full diagnostic range. It covers RPM up to 20,000, pulse width out to 20ms, and adds PC data logging — all specs the BTMETER can’t match. The BTMETER BT-770K is still a solid runner-up for DIYers who prioritize a big backlit display and a zipped carry case over maximum range.
If you’re on the fence, ask yourself this: do you ever work on 2-stroke engines or high-revving performance cars? If yes, get the Allsun. If you only work on standard 4-stroke vehicles under 12,000 RPM, the BTMETER will save you money and give you a better experience in the dark.
Winner: Allsun Automotive Dwell Meter
- Multi-Function Digital Multimeter: Dwell Meter RPM Automotive accurately...
- Measuring The Essential Informations:The Tachometer Meter performs standard...
- Full Auto Meter&Hand Free:The tach and dwell meter defaults to autorange in...
Best for professional mechanics and tuners who need up to 20,000 RPM, 20ms pulse width, and PC data logging. The extra range covers engines the BTMETER simply can’t handle.
Runner-Up: BTMETER BT-770K Auto Ranging Automotive Multimeter
- ⚡【Automotive Multimeter】Measure AC DC Amperage to 20A, AC DC Volt to...
- ⚡【For Mechanics and DIYers】High accuracy 6000 counts multi-tester...
- ⚡【Large LCD Display】This voltmeter using the words 20mm, 3.0 inch LCD...
Best for DIYers and home mechanics who want a large 3-inch auto-backlight LCD, a knob LED for dark work, and a zipped carry case. It handles standard cars up to 12,000 RPM with ease.
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