Diagnostic Multimeter Car Circuit Tester
Diagnostic Multimeter Car Circuit Tester

AUTOOL DM303 Diagnostic Multimeter Car Circuit Tester

(48 customer reviews)

$189.90

  • 12 Test Functions: Oscilloscope Function to visualize the signal change.
  • Auto Range & True RMS: The multimeter will automatically select the appropriate measurement depending on what it detects.
  • After-sales Service: Three-Year Warranty, Lifetime Maintenance. Online Support>>

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AUTOOL DM303 Auto Diagnostic Multimeter Car Circuit Tester with K/CAN/Oscilloscope/Cranking/Analog Signal/Injector Test

The automotive diagnostic multimeter is a new handheld diagnostic oscilloscope multimeter integrating digital oscilloscope, digital multimeter, automotive circuit, and automotive signal detection, using embedded digital control technology.

Warm Tips
  • Please note that DM303/DM301 car multimeter is shipped without batteries, you need to buy them separately. You can choose to install 4pcs 1.5A batteries, or you can install lithium battery by yourself, the lithium battery style is as below picture. If you install lithium batteries, you can charge it, but not dry batteries.

Lithium Battery

AUTOOL DM303 Manual
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Diagnostic Multimeter Car Circuit Tester

What is the Difference Between DM301 & DM303?

AUTOOL DM301 vs DM303 Comparison Summary

Function and Measurement Mode

AUTOOL DM303 is a more advanced version, with 13 measurement modes, and its functions are more comprehensive than DM301’s 6. In addition to conventional voltage, current, resistance, frequency and oscilloscope tests, DM303 also supports: Fuel Injector Testing、Relay Testing 、Automotive Circuit Testing、Automotive Starting Testing、Signal Simulation Testing、CAN Line & K/LIN Line Data Reading. These extended functions enable DM303 to be more efficiently applied to vehicle electronic control system diagnosis and complex fault detection.

Power Supply System

AUTOOL DM301 is powered by dry batteries and a TYPE – C interface, and also supports optional lithium batteries. DM303 further enhances the power configuration and supports 12V rechargeable batteries, which can meet the needs of long – term outdoor or repair station use.

Accessories and Design

AUTOOL DM303 is randomly equipped with 6 types of test leads, which is much more than DM301’s 2 types, providing a more flexible connection method and adapting to more test scenarios. Both are equipped with a flashlight function and a toolbox configuration, which is convenient for operation at night or in narrow spaces.

AUTOOL Auto Diagnostic Multimeter Quick Search

AUTOOL DM303 Automobile Diagnostic Multimeter Features

  • 2.8-inch color screen display: You can adjust the screen operation, the data is clear and intuitive, suitable for a variety of working environments.
  • Plastic Toolbox:  It can well organize the host and accessories, is easy to carry, and the case is drop-proof and collision-proof to effectively protect the instrument.
  • Oscilloscope Function:  The waveform test has a bandwidth of 500 kHz and uses variable sampling frequency to measure slowly changing signals. It is suitable for automotive maintenance, allowing observation of various signals in automotive circuits, including motor drive signals, motor power voltage in electric vehicles, ignition signals, camshaft signals, and crankshaft signals in fuel engines.
  • Auto Range & Ture RMS: Simply select the mode and connect your leads. The multimeter will automatically select the appropriate measurement depending on what it detects. With True RMS, the DM303 portable multimeter provides you with clear, accurate readings whenever and wherever you need them.
  • Wiring Functions: Equipped with 8 wiring lines for various functions, including a multifunction test line, battery clip line, ignition pulse signal test line, car circuit test line, jumper, and multimeter probe. The multifunction test line checks battery voltage, fuel injectors, relays, K-wire and CAN bus signals, car ECU, and other parts.
  • Multi-language: Support 12 languages, English, French, Portuguese, Polish, Spanish, Japanese, Russian, Italian, German, Dutch, Korean, and Chinese.
  • 3-Year Warranty: For damage caused by non-human factors, we promise to reissue parts free of charge within 3 years.

AUTOOL DM303 Automobile Diagnostic Multimeter Functions

  • Multimeter Tester: Detects 1000V DC and AC voltages, measures 200mA DC and AC and detects Resistance and Diodes.
  • Oscilloscope Function: The handheld oscilloscope has a 500kHz bandwidth. One-button automatic display of the measured waveform.
  • Ignition Diagnostic: Select the engine cylinder type and ignition and calculate the speed of different engine cylinders.
  • Wire Instructions
  • 1Hz~1MHz Signal Frequency: The measurement needs to connect to a valid signal source with a voltage greater than 1V.
  • Cranking Test: The vehicle start test indicates normal operation if the minimum battery voltage is above 9.6V. If it drops below 9.6V, it may indicate battery aging.
  • Injector Test: The multimeter can drive the injector for testing, and can also detect the real-time injector signal. It can test electromagnetic injectors, including GDI injectors, but doesn’t support 120V injectors
  • Analog Signal Test:  The multimeter can simulate 5V square wave and 5Vpp sine wave signals, and it can also connect to a battery for 12V square wave signals using a multifunction detection cable.
  • True-RMS Multimeter: Automatically ranging true mean squared (TRMS) technology for increased accuracy. The True-RMS Multimeter is ideal for a wide variety of electrical and electronic testing applications
  • Auto Range Function: Automatically displays the measured data, saving the tedious process of manually selecting the range of measured values
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48 reviews for AUTOOL DM303 Diagnostic Multimeter Car Circuit Tester

4.9
Based on 48 reviews
5 star
93
93%
4 star
2
2%
3 star
4
4%
2 star
0%
1 star
0%

Customer Images

Image #1 from Bill
Image #1 from Gabriele Moretti
Image #2 from Gabriele Moretti
Image #1 from Cerdic
Image #1 from Matt Sophy
Image #2 from Matt Sophy
Image #3 from Matt Sophy
Image #1 from Bill Benedict
Image #2 from Bill Benedict
Image #3 from Bill Benedict
Image #1 from Bill

Bill

I’ve been using the DM303 multimeter and it’s been a great help. The 2.8-inch color screen is clear and easy to read in different working conditions. The oscilloscope works well for checking automotive signals, and the auto range and true RMS make measurements accurate. It comes with plenty of test cables, supports multiple languages, and the plastic toolbox keeps everything organized and protected. Very reliable for auto repair work.

(0) (0)
Image #1 from Gabriele Moretti

Gabriele Moretti

Reliable relay testing, efficient ignition and injector testing, accurate automotive circuit analysis, accurate analog signal analysis, versatile and efficient, convenient and easy to use, high-quality materials, reliable K/CAN system testing,

(0) (0)
Image #2 from Gabriele Moretti

Gabriele Moretti

Reliable relay testing, efficient ignition and injector testing, accurate automotive circuit analysis, accurate analog signal analysis, versatile and efficient, convenient and easy to use, high-quality materials, reliable K/CAN system testing,

(0) (0)
Image #1 from Cerdic

Cerdic

The AUTOOL DM303 is very easy to use, with accurate measurements and comprehensive functions. Whether it is voltage, current or resistance detection, the display is clear and intuitive, and the operation is also very simple. It is very cost-effective and very suitable for car owners and maintenance technicians.

(0) (0)
Image #1 from Matt Sophy

Matt Sophy

My new favorite tool in my tool

(0) (0)
Image #2 from Matt Sophy

Matt Sophy

My new favorite tool in my tool

(0) (0)
Image #3 from Matt Sophy

Matt Sophy

My new favorite tool in my tool

(0) (0)
Image #1 from Bill Benedict

Bill Benedict

The quality is excellent, the texture is very good, the detection is very accurate, and the accessories are very complete. I have used it many times, and it works perfectly.

(0) (0)
Image #2 from Bill Benedict

Bill Benedict

The quality is excellent, the texture is very good, the detection is very accurate, and the accessories are very complete. I have used it many times, and it works perfectly.

(0) (0)
Image #3 from Bill Benedict

Bill Benedict

The quality is excellent, the texture is very good, the detection is very accurate, and the accessories are very complete. I have used it many times, and it works perfectly.

(0) (0)
Image #4 from Bill Benedict

Bill Benedict

The quality is excellent, the texture is very good, the detection is very accurate, and the accessories are very complete. I have used it many times, and it works perfectly.

(0) (0)
Image #1 from Bill
Image #1 from Gabriele Moretti
Image #2 from Gabriele Moretti
Image #1 from Cerdic
Image #1 from Matt Sophy
Image #2 from Matt Sophy
Image #3 from Matt Sophy
Image #1 from Bill Benedict
Image #2 from Bill Benedict
Image #3 from Bill Benedict
Image #4 from Bill Benedict
1-5 of 48 reviews
  1. Bill

    I’ve been using the DM303 multimeter and it’s been a great help. The 2.8-inch color screen is clear and easy to read in different working conditions. The oscilloscope works well for checking automotive signals, and the auto range and true RMS make measurements accurate. It comes with plenty of test cables, supports multiple languages, and the plastic toolbox keeps everything organized and protected. Very reliable for auto repair work.

    Image #1 from Bill
    (0) (0)
  2. Noah

    Reliable relay testing, machine trigger testing, and efficient injector operation Precise automotive circuit analysis and analog signal analysis Wide-range and efficient performance Convenient and easy operation High-quality materials Reliable K/CAN test system

    (0) (0)
  3. Luke

    I’ve been using it for a month and it hasn’t let me down, it’s been wonderful, and today it was very helpful in detecting a problem. I highly recommend it.

    (0) (0)
  4. Adam

    It’s very good; I liked its solid construction, its fast and accurate measurements, the very useful ignition function, as well as the oscilloscope function.

    (0) (0)
  5. Gabriele Moretti us
    Useful Diagnostic Multimeter

    Reliable relay testing, efficient ignition and injector testing, accurate automotive circuit analysis, accurate analog signal analysis, versatile and efficient, convenient and easy to use, high-quality materials, reliable K/CAN system testing,

    Image #1 from Gabriele Moretti
    Image #2 from Gabriele Moretti
    (0) (0)
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