Best Automotive Multimeters
Motor1 Reviews Team Take:
- The best automotive multimeters on the 2024 market are the Fluke 115, Fluke 88V, Innova 3320 Digital Multimeter, AstroAI Digital Multimeter, and Klein Tools MM400 Multimeter.
- Automotive multimeters range in price with a budget and beginner product being around $40, while a more advanced and high-quality multimeter can be upward of $200.
- When it comes to an automotive multimeter, it’s worth considering the display for easy readability along with the accuracy of readings.
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for Beginners
An auto-ranging multimeter suitable for DIY and more.
Without the right tools, an electrical problem in your car can be difficult to diagnose. Common electrical issues in cars range from a dead battery to a bad alternator. An automotive multimeter is a handheld device that can measure voltage, current, and resistance in the electric components of a vehicle. With one, you can gauge the strength of your car’s battery, locate electrical issues, and even determine issues with headlights, rogue circuits, and more.
If you’re new to automotive multimeters or home auto repair, it’s easy to feel overwhelmed by all the options out there. That’s why our expert review team has reviewed, tested, and rated the best automotive multimeters on the market to narrow down your search.
Automotive Multimeter Reviews
For this review, our team thoroughly tested and evaluated each automotive multimeter based on each item’s display, accuracy, and additional features. The scores in each category are compiled into a single overall rating that ranges from 1.0 to 5.0 stars.
What Is The Best Automotive Multimeter?
We named the Fluke 115, Fluke 88V, Innova 3320 Digital Multimeter, AstroAI Digital Multimeter, and Klein Tools MM400 Multimeter as the best-rated automotive multimeters on the market in 2024.
| Brand/Model | Cost | Overall Rating | Award |
|---|---|---|---|
|
Fluke 115 |
$230 |
5.0 |
Best Overall |
|
Fluke 88V |
$510 |
4.8 |
Best Additional Features |
|
Innova 3320 Digital Multimeter |
$30 |
4.7 |
Best for Beginners |
|
AstroAI Digital Multimeter |
$35 |
4.5 |
Best Display |
|
Klein Tools MM400 Multimeter |
$55 |
4.3 |
Best Build Quality |
*Because cost data fluctuates, the prices in the table above are approximate values that our team regularly updates.
Automotive Multimeter Ratings: Our Testing Process
After looking at factors such as power, ease of use, customer ratings, and prices, our product testing team ordered the automotive multimeters that best met these standards. A team member tested each product on a 2017 Ford Fusion Hybrid SE, taking note of how well the automotive multimeter display looked, accuracy, and additional features. Each automotive multimeter was given a rating out of 5.0 stars based on these criteria.
Learn more about how we tested automotive multimeters here.
1. Fluke 115: Best Overall
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- Cost: $230
- Amazon rating: 4.8 out of 5.0 (approx. 2,200 reviews)
- Operating temperature: -10.0 to 50.0 degrees Celsius
- In the box: Fluke 115 Digital Multimeter, holster, pre-installed 9V battery, 4.0-millimeter silicone lead test set, and a user manual
- Large white LED backlight display
- Maximum voltage AC/DC 600.0V
- CAT III 600.0V safety rated
- True-RMS accurate
Thanks to its True-RMS (root mean square) accuracy, the Fluke 115 multimeter provides precise measurements on non-linear loads. It measures frequency, current, resistance, continuity, and much more. While it can reach up to 600.0V for AC/DC readings, the Fluke can also accurately measure up to 600.0 ohms as well.
You can see how the Fluke 115 performed in each of our testing categories below:
| Review Category | Score (Out of 5.0 Stars) |
|---|---|
| Display | 5.0 |
| Accuracy | 5.0 |
| Additional Features | 5.0 |
| Overall Rating | 5.0 |
The Fluke 115 has a durable casing designed to handle the effects of drops, shocks, and humidity. Each fluke multimeter is independently tested for safe use in CAT III 600.0V environments, making it ideal for both professional and personal projects. Below are the pros and cons of the Fluke 115:
- Wide operating temperature range
- Durable and protective case
- True-RMS accurate
- Display can be difficult to see
The Fluke 115 multimeter produced accurate readings according to our standards and had extra features we enjoyed. The bright display was a plus, too. If you need a reliable, all-around automotive multimeter that provides timely readings with certainty, the Fluke 115 is worth checking out. It offers the best of essential multimeter features and has sturdy build quality, too.
Display: The Fluke 115 has a white LED backlight display that was easy for us to read in both low and bright lighting.
Accuracy: Using the silicone lead test set, we got a measurement within 0.05V of the battery’s energy capacity. We were also able to conduct a calibration of the Fluke 115 to ensure future accuracy.
Additional Features: The Fluke 115’s Mix/Max/Average feature, which allows users to watch for fluctuations in an electric signal while measuring, was helpful to our team.
Considering that over 98 percent of all reviews are 4.0-star ratings and above, this multimeter is very well-liked. Many of the positive reviews commend the Fluke 115 for its rugged yet portable design. The very few negative reviews present claim the display can only be viewed from certain angles.
2. Fluke 88V: Best Additional Features
- Cost: $510
- Amazon rating: 4.8 out of 5.0 (approx. 200 reviews)
- Operating temperature: -20.0 to 55.0 degrees Celsius
- In the box: Fluke 88V digital multimeter, high-impact holster, test leads, and a user manual
- CAT III 1,000.0V safety rated
- CAT IV 600.0V safety rated
- 50.0 ohms max resistance
- Manual and auto-ranging modes
The Fluke 88-5 is safety rated for CAT III up to 1,000.0V and CAT IV to 600.0V, so it can handle nearly any current thrown its way. It can measure up to 1,000.0V AC/DC and 50.0 ohms, making it one of the best in our roundup for high electrical outputs. While it excels at measuring frequencies and resistance, the Fluke 88-5 also determines continuity, diode testing, and temperature.
You can see how the Fluke 88V performed in each of our testing categories below:
| Review Category | Score (Out of 5.0 Stars) |
|---|---|
| Display | 4.5 |
| Accuracy | 5.0 |
| Additional Features | 5.0 |
| Overall Rating | 4.8 |
For cars, the Fluke 88-5 can perform millisecond pulse width measurements for fuel injectors to help determine how efficiently an engine is running. Beyond its technical capabilities, the Fluke 88-5 is equipped with a TPAK magnetic meter hanger for easy setup and viewing. Below are the pros and cons of the Fluke 88V:
- Wide operating temperature range
- High voltage
- Multiple testing features
- Expensive
- Display can be difficult to see
Based on our experience with the Fluke 88V, we rated it a strong 4.8 stars for its functionality and accuracy. We recommend the Fluke 88V for anyone who needs more than just frequency testing or likes to have additional features for any situation. Its various testing capabilities make the Fluke 88V a well-respected multimeter in any mechanic’s arsenal.
Display: Although easy to read, the Fluke 88V’s display wasn’t nearly as bright as we had hoped, even when its backlight was activated.
Accuracy: We were able to get a stable reading within 0.05V of our battery’s voltage. One thing we were impressed with was how quickly the Fluke 88V reached and then stayed at its measurement.
Additional Features: Beyond frequency testing, the Fluke 88V is designed to measure current, resistance, capacitance, and temperature.
Over 90 percent of customers rate the Fluke automotive multimeter a perfect 5.0 out of 5.0 stars. A common praise among positive reviewers is the Fluke 88V’s longevity, with some customers claiming to have purchased older models in the 1990s that still perform well today. One of the only complaints about the Fluke 88V is that some customers wish it came with more leads.
3. Innova 3320 Digital Multimeter: Best For Beginners
- Cost: $30
- Amazon rating: 4.5 out of 5.0 (approx. 7,000 reviews)
- Operating temperature: 0 to 40.0 degrees Celsius
- In the box: Innova 3320 device, test leads, one AAA battery, and a user manual
- Auto-ranging scales
- Color-coded LED battery lights
- Single-setting resistance function for AC/DC
- Built-in stand and wrist strap
- Protective rubber corner guards
Because of its color-coded interface, simplistic design, and single-setting resistance readers, the Innova 3320 Digital Multimeter is perfect for anyone unfamiliar with multimeters. Its auto-ranging scales can dial in the correct range for electronic measurements to assist users with finding accurate results.
You can see how the Innova performed in each of our testing categories below:
| Review Category | Score (Out of 5.0 Stars) |
|---|---|
| Display | 5.0 |
| Accuracy | 4.5 |
| Additional Features | 4.5 |
| Overall Rating | 4.7 |
The Innova 3320 comes with attachable test leads, holders, and a stand for added efficiency. It is a UL-certified multimeter, making it safe for both automotive and household use. Below are the pros and cons of the Innova 3320 Digital Multimeter:
- Low cost
- Color-coded dials and buttons
- Simple design
- Few additional features
- LED lights work inconsistently
Our review team rated the Innova 3320 at 4.7 stars. The Innova 3320 Auto-Ranging Digital Multimeter is great for anyone looking to complete DIY projects and repairs and has little experience with multimeters. It’s a great gift for beginners that rivals many of its higher-grade competitors.
Display: The display on the Innova 3320 is exceptional. It’s built with the user in mind, especially with its color-coded dials and buttons.
Accuracy: We thought the accuracy of the Innova 3320 was spot-on. It gave us a reading within a couple of hundredths of the battery’s charge.
Additional Features: Our review team was impressed with the Innova 3320’s single-resistance setting for AC and DC voltage, as it made testing much easier to conduct. It did lack other features we had hoped to see, though.
The Innova 3320 is well-received by customers, with about 70 percent of reviewers leaving a 5-star rating. Reviewers with positive things to say about the Innova 3320 complement its automatic single-resistance setting as well as its versatile size. Some with less positive comments say their multimeters have LED lights that do not work.
4. AstroAI TRMS 6000 Digital Multimeter: Best Display
- Cost: $35
- Amazon rating: 4.6 out of 5.0 (approx. 15,000 reviews)
- Operating temperature: 0 to 40.0 degrees Celsius
- In the box: AstroAI device, one pair of test leads, K-Type thermocouple, multi-function socket, and a user manual
- Large LCD backlit screen
- Auto shutoff
- Hanging magnet
- Multi-function socket
- Explosion-proof ceramic fuse tubes
The AstroAI TRMS 6000 Digital Multimeter can accurately measure AC and DC current, voltage, capacitance, frequency, and more. One of its best features is its thoughtfully designed LCD display, which is backlit for better readability in low-light environments.
You can see how the AstroAI performed in each of our testing categories below:
| Review Category | Score (Out of 5.0 Stars) |
|---|---|
| Display | 4.5 |
| Accuracy | 4.5 |
| Additional Features | 4.5 |
| Overall Rating | 4.5 |
The TRMS 6000 also has an automatic shutoff feature, plus a hanging magnet and kickstand for hands-free use. Its double ceramic fuse is resistant to burns and protects the rest of the device from overloading. Below are the pros and cons of the AstroAI TRMS 6000 Digital Multimeter:
- Explosion-proof tubes
- Automatic shutoff feature
- Overload protection
- Takes a longer time to get results
- Poor quality test leads
Based on its bright display and wide range of additional features, we rate the TRMS 6000 highly. Because of its large screen, the AstroAI TRMS 6000 Digital Multimeter is perfect for those who require enhanced readability. It also works well for projects that require multiple electrical measurements.
Display: Thanks to its extra-large backlit screen, reading measurements on the TRMS 6000 is very easy.
Accuracy: Although we were able to get accurate readings using the TRMS 6000, it took longer than expected.
Additional Features: We found the various test leads that came with the TRMS 6000 would be useful for any given situation, be it temperature or AC and DC testing. Also, this multimeter offers more than seven different measurement standards for all sorts of electric devices.
Over 90 percent of the TRMS 6000’s ratings are 4.0 stars or higher. A feature of this automotive multimeter that customers admire in reviews is the easy-to-replace fuse. They also like how strong the magnetic mount was and its LCD screen. One common negative feature that is mentioned frequently is the poor quality of the test leads.
5. Klein Tools MM400 Multimeter: Best Build Quality
- Cost: $35
- Amazon rating: 4.7 out of 5.0 (approx. 3,600 reviews)
- Operating temperature: 0 to 40.0 degrees Celsius
- In the box: Klein Tools device, one pair of test leads, thermocouple adapter, batteries, and a user manual
- CAT III 600.0V safety rating
- 600.0V AC/DC voltage
- Digital auto-ranging
- Easy-to-access battery compartment
- Strong plastic frame
The Klein Tools MM400 Multimeter can measure up to 600.0V AC/DC voltage and 10.0A AC/DC current. This multimeter has a CAT III 600.0V safety rating as well as 40.0 ohms of resistance.
You can see how the Klein Tools performed in each of our testing categories below:
| Review Category | Score (Out of 5.0 Stars) |
|---|---|
| Display | 4.5 |
| Accuracy | 4.5 |
| Additional Features | 4.0 |
| Overall Rating | 4.3 |
Thanks to its impeccable build quality, the MM400 is built to withstand a drop up to 1.0 meter. Its durable plastic frame also handles daily wear and tear very well. Below are the pros and cons of the Klein Tools MM400 Multimeter:
- Great build quality
- Digital auto-ranging
- Limited features
- Fuses short out easily
Our review team likes the MM400 for its impeccable build quality. We recommend the Klein Tools MM400 Multimeter for hobbyists who are prone to dropping their tools or electricians who work in areas where durability is a must, such as construction sites.
Display: The display on the MM400 was adequate. It was fairly easy to read but did not have a bright backlight.
Accuracy: We were able to get an accurate reading on our battery within a couple of volts.
Additional Features: Unfortunately, the MM400 is quite limited in what it can measure. It still had an auto-ranging feature, though, which we liked.
Many customers enjoy using this multimeter for its clear readouts and high-quality large display. Some reviews commend the lead wires’ flexibility. Close to 95 percent of all ratings for the Klein Tools MM400 Multimeter are 4.0 stars or higher. A common complaint is that the fuses on this multimeter short out easily.
Automotive Multimeter Buying Guide
Before starting your search, consider checking out our buyers guide to learn more about how automotive multimeters function and their key features.
What Is A Multimeter?
A multimeter is a handheld instrument designed to measure electric currents, voltage, and resistance over several ranges of value. They are valuable for automotive use, as mechanics rely on them to run engine diagnostics and check their overall electrical performance.
The two main types of multimeters are digital and analog. Digitals are more commonly available than analogs and provide direct numeral readings with higher accuracy. They also have a higher resistance and can perform functions that analog multimeters cannot, such as temperature readings.
Typically, multimeters are equipped with tester leads that measure electricity output. Multimeters with automatic ranging sensors can gauge the electricity output taken by the leads and provide an accurate reading within seconds. Most digital multimeters have automatic ranging while analog ones have manual ranging.
Accuracy
When using a multimeter, potentially the most important aspect, is an accurate reading. As mentioned above, mechanics and owners of this product rely primarily on them to run engine diagnostics and electrical performance.
By looking at both our testing results and customer reviews, you can determine which multimeter provides the most accurate results to give you peace of mind that you’re not only making a good purchase but also owning a product that will work reliably and give the correct readings.
Additional Features and Value
Automotive multimeters are not a particularly small investment. While some are lower in price compared to others, you’ll want to consider what each multimeter has to offer and how long-lasting it seems it will be so you aren’t constantly replacing a cheap multimeter.
Depending on your vehicle’s age and what you plan to use the multimeter for, you may want to consider a more expensive product that has additional features like testing engine temperature and decibels to see what issues may be occurring in an older engine. While an investment, it may be more worth your value when considering the different multimeters on the market.
Compare Automotive Multimeters
| Brand/Model | Operating Temperature | Maximum Voltage | Item Weight |
|---|---|---|---|
| Fluke 115 | -10.0 to 50.0 degrees Celcius | 600.0 Volts | 1.2 pounds |
| Fluke 88V | -20.0 to 55.0 degrees Celsius | 1,000.0 V | 1.0 lb. |
| Innova | 0 to 40.0 degrees Celsius | 600.0 V | 0.5 lbs. |
| AstroAI | 0 to 40.0 degrees Celsius | 600.0 V | 1.3 lbs. |
| Klein | 0 to 40.0 degrees Celsius | 600.0 V | 0.5 lbs. |
Best Automotive Multimeters: Bottom Line
In this article, along with sharing helpful purchasing tips for those interested in purchasing an automotive multimeter, we reviewed the top five automotive multimeters in 2024:
- Best Overall: Fluke 115
- Best Additional Features: Fluke 88V
- Best for Beginners: Innova 3320 Digital Multimeter
- Best Display: AstroAI Digital Multimeter
- Best Build Quality: Klein Tools MM400 Multimeter
Automotive Mulitmeters: FAQ
Below are some common frequently asked questions about automotive multimeters:
What are the main features of a multimeter?
A typical multimeter includes features that measure voltage, current, and resistance. Some models, particularly digital ones, may be able to measure capacity, frequency, temperature, conductance, and duty cycle.
Can you get shocked while using a multimeter?
It is possible to be accidentally shocked if you’re using a multimeter that hasn’t been properly maintained. This occurs when a multimeter attempts to measure a current that is too high for its capacity or if its testing leads are faulty.
In order to prevent accidental electrocution, perform a visual inspection of your multimeter before using it. If the device or its leads seem cracked or frayed or if there are gaps between the wire and probes, replace them immediately. Many multimeters are equipped with overload protection to warn their users if the current they’re measuring is too strong.
Can multimeters measure AC currents?
Most multimeters can measure both AC and DC. This works when the multimeter is connected in series with a circuit, in which the current is measured provided the current in that circuit is limited or controlled by a load or appropriate values of resistance.
Full Automotive Multimeter Testing Methodology
We assembled each automotive multimeter according to the manufacturer’s instructions. For consistent testing standards, we used each multimeter to measure the voltage of a fresh AA battery. Each multimeter was calibrated before measuring voltage to ensure the best possible results.
A team member tested each product on a car, taking note of the quality of the multimeter’s display, the accuracy of its voltage testing, and the additional features that each multimeter could measure. Each multimeter was given a rating out of 5.0 stars based on this criteria.
Display: A multimeter must be able to clearly present the measurements at hand. Automotive multimeters that had distinct, easy-to-read displays scored higher in this category.
Accuracy: A multimeter’s primary function is to measure voltage in volts, resistance in ohms, and current in amperes so they can troubleshoot issues with electrical equipment. Multimeters in our roundup that were able to consistently provide accurate readings scored higher in this category during our testing process. An accurate measurement by our standards consisted of a reading within 0.05 volts (V) of an unused 1.5-volt battery.
Additional Features: Beyond testing for volts, ohms, and amps, some multimeters can also test for temperature and decibels. Multimeters that were able to measure for these performed better and scored higher in this category during our testing process.
How We Score Products
Star ratings help ensure that we are honestly evaluating each product that’s included in our reviews by comparing how each holds up and performs in our testing process. For the automotive multimeters in this review, we calculated an average rating of 4.7 out of 5.0 stars.
- 5.0 Stars: A 5.0-star rating is a well above average rating. If the automotive multimeter had an easy-to-use display, was accurate during the testing process, and had a good amount of both additional and useful features, you’ll see a high score of 5.0 stars.
- 4.0 Stars: A 4.0-star rating is an above average rating. While the automotive multimeters with this rating likely exceeded our expectations, they did not compare to our top pick and could potentially be slightly easier to use or have a few more features.
- 3.0 Stars: A 3.0-star rating is an average score. If one of the automotive multimeters was very simple and provided the basic functionality but could use more features when comparing it to other products we tested, you’d likely see an average rating for the “additional features” testing criterion.
- 2.0 Stars: A 2.0-star rating is a below-average rating. If there were accuracy issues that impacted the results we got during our testing process, you’ll see a lower rating overall.
- 1.0 Star: a 1.0-star rating is the lowest score we give in our reviews. If the automotive multimeter is defective in some way that affects the display or accuracy of the product, you’ll see a 1.0-star rating.
Why Trust Motor1.com
Each year, we test over 350 auto products on vehicles and in our testing lab. Our team of product testers thoroughly researches top products, unboxes and puts our hands on each component, and tests the items on real vehicles before making recommendations to readers.
We publish hundreds of product and service reviews to bring car enthusiasts detailed guides on automotive tools, detailing kits, car seats, pet products, and much more. For more information on our testing methodology and how we evaluate every product, check out our methodology page here.
*Data accurate at time of publication. Products subject to availability.
