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4 Test Functions:
- Voltage Measurement: Switch to DC voltage measurement, AC voltage measurement and oscilloscope mode (observe signal waveform) with one click.
- Current Measurement: Switch between DC current measurement and AC current measurement with one click, and you can also switch between high current mode (20A) and low current mode (mA). There is a 15A 30V self-recovery fuse inside, which can protect the amp meter from damage due to excessive current.
- Resistance Measurement: Switch to resistance measurement, diode/low resistance measurement and remote key (3V) leakage detection with one click. The meter will give a sound prompt when the measured resistance is too low.
- Frequency Measurement: The measurable signal voltage amplitude is a maximum voltage value of 1000V. You need to connect to a valid signal source when measuring, and the signal source voltage Vpp should be greater than 1V.
9 Test Functions:
- Oscilloscope Mode: There will be maximum, minimum and average values to record signal fluctuations. You can pause the waveform display by pressing the button, and you can also control the waveform to move up, down, left and right for easy comparison and observation.
- It applies to measuring and observing various signals on the automobile circuit during the car overhaul, including the motor drive signal and motor power voltage of new energy vehicle, fuel car engine ignition pulse signal, camshaft signal, crankshaft signal wheel speed sensor signal, oxygen sensor signal and so on.
Supports 13 languages
The digital multimeter tester can choose the language in the settings: English, Russian, French, Italian, German, Spanish, Portuguese, Polish, Dutch, Simplified Chinese, Traditional Chinese, Korean and Japanese.
Basic Settings
The multimeter's key tone can be set to on/off, but the warning tone cannot be turned off. The screen brightness can be set to 1-19 levels, and the automatic shutdown time can be set to 1-30 minutes.
Calendar and Time Settings
The multimeter supports setting calendar and time (year/month/day/hour/minute/second). Note: This setting is designed for future upgrades to the tester’s printing capabilities.
Two Power Supply Methods
When the battery symbol on the LCD turns red, it reminds you that the battery is low. It has a built-in 1200mAh rechargeable lithium battery, which makes charging more convenient and efficient. It can also be powered by ordinary alkaline batteries (not included in the package).
SD Card Slot and USB Charging Port
The multimeter can update the application software through a MicroSD card (not included in the package). Please refer to the manual for specific operating steps.
Flashlight Design
Make sure you can easily use the multimeter tester in dimly lit areas.
Specifications:
2.8-Inch LCD Resolution: 320*240
Analog Bandwidth: 500KHz
Working Temperature: 0-40℃(32-104℉)
Working Humidity: ≤ 75%
Storage Temperature: 10-50℃(14-122℉)
Storage Humidity: ≤ 70%
Doug Akers
Reviewed in the United States on July 30, 2024
I have had several multimeters over the years and this has been as good as any I have ever used. As good as the more expensive fluke meters I still own. I mainly use it for off grid solar installs. This meter however has more functions than I will ever use though.
Gerry Pulliam
Reviewed in the United States on May 31, 2024
I been a Gm technician for many years and we used the fluke 87 rms meter . This new autool DM 303 is one of the best meter I ever seen . It has a lot of test for the automotive world . I highly recommend this meter to any auto technician out there to get this meter . Well worth the money . Buy the master kit. You will be amazed what this meter can do
Reviewer
Reviewed in the United States on March 4, 2024
This thing is ridiculous, it's got 1000 ways to be used and applications. It includes a very complete set of cables and adapters for anything you'd ever want to use it for, and the instruction manual is surprisingly good for it. I've only used it a few times now but I'm loving it. The display is very nice and easy to use. Remember to 0 it out before you start measuring something.
Rob
Reviewed in the United States on October 25, 2024
So far i have loved this multimeter. It has been absolutely amazing, but today while using the relay tester, i disconnected the relay and multimeter was at the home screen and i noticed smoke. The relay testing wires were live still and somehow shorted to the frame of a truck through the casing of the wire and melted. I need more cables, but i dont see them on cmtools page. I would like to buy them and not a whole multimeter setup.
Dean D
Reviewed in the United States on January 1, 2024
The CMTOOL Multimeter Tester has been a real asset in my toolkit. The craftsmanship and high-quality materials are immediately apparent, making it clear that this multimeter is built to last. The value for money is outstanding, considering it boasts 13 main functions, including voltage testing, current measurement, resistance checking, and even functioning as an oscilloscope.I've found it to be incredibly versatile, tackling a range of tasks with ease. Whether I'm measuring DC or AC voltage, checking continuity, or testing resistance, this tool handles it all. The included multi-test leads and probes kit adds to its functionality, providing the necessary accessories for various applications.For anyone in need of a reliable and affordable multimeter, the CMTOOL version is a solid choice. It's become an indispensable tool for my DIY projects and electrical work, proving that quality and functionality don't always have to come with a hefty price tag.Actually, still very surprised that it does as many functions as it does. I still haven't completely been able to figure out 100% all of the functions but so far what I have used and what I have read in the manual. This is definitely going to be a very handy tool to keep around.
Jason
Reviewed in the United States on December 28, 2023
This multimeter does a ton of functions useful when working on vehicles. All of the available tests and functions are clearly laid out in the instruction manual that is very well written. There are illustrations on how to connect the probes and different wiring adaptors to be able to get diagnostics information. Even the multimeter probes are extremely sharp and able to pierce insulation (only when no other option is available, of course). The option of using the included rechargeable battery pack or using alkaline batteries is a nice option to have (especially when you are in the field). There is also a small led flashlight built into the multimeter to help light up the work area in a pinch. The display shows the information clearly and with larger numbers so you can read the numbers from a distance. Overall, this multimeter combines many other diagnostic devices into a compact usable format. A powerful tool for many different uses. Recommended!
J. Holmgren
Reviewed in the United States on December 18, 2023
With as many functions as this unit has, I though it would be super hard to figure out how to do something simple like a DC voltage reading. Nope, the layout on the screen is intuitive and simple. I like that it's capable of using the rechargeable built in battery or regular batteries. It comes with a very nice case and a ton of different probes depending on what you're measuring. All in all it seems like an excellent meter for auto fault diagnosis. I especially like the oscilloscope functionality. This is pretty much a do-it-all meter for car/truck use.
Christopher Robin
Reviewed in the United States on December 12, 2023
Only used this on 12V, worked great on Monday. I put it away after work and it would no longer power on Tuesday. I take very good care of my tools, this is a fail.Update - I got a replacement from the manufacturer, I did have to jump through hoops to get it. All of the below considered, it's a pretty dang impressive meter with an amazing amount of functionality. It is accurate and VERY feature rich. This will be my GO TO for sure. The first defective one, I get it, sometimes something slips through the cracks, I am even OK with that.I am giving the product itself 5 stars and a truly impressive tester, but my overall experience was less than delightful.
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