AUTOOL DM303 Automotive Diagnostic Multimeter

Advanced Automotive Electrical Testing Tool

The AUTOOL DM303 Automotive Diagnostic Multimeter is a professional-grade handheld diagnostic tool engineered for advanced automotive electrical testing and fault analysis. Combining a digital multimeter, oscilloscope, automotive circuit tester, and signal diagnostic capabilities in one compact unit, the DM303 delivers accurate diagnostics for modern petrol, diesel, hybrid, and electric vehicles. Designed for workshops and technicians, it supports injector testing, relay diagnostics, ignition pulse analysis, and CAN/K-line signal detection for efficient and precise troubleshooting.

The AUTOOL DM303 Automotive Diagnostic Multimeter is a professional-grade handheld diagnostic tool engineered for advanced automotive electrical testing and fault analysis.

Main Features

12 Integrated Automotive Test Functions – The AUTOOL DM303 integrates key testing capabilities, including voltage, current, resistance, oscilloscope analysis, circuit and cranking tests, injector and relay testing, analogue and ignition signal analysis, K-Line & CAN Bus diagnostics, and frequency measurement. It provides efficient, all-in-one electrical diagnostics for petrol, diesel, hybrid, and electric vehicles.
4-in-1 Diagnostic Functionality – Combines a digital multimeter, oscilloscope, automotive circuit tester, and signal diagnostic tool in one professional handheld device.
Integrated Digital Oscilloscope – Features a high-performance oscilloscope with up to 500kHz bandwidth for accurate waveform capture and electrical signal analysis.
CAN Bus & K-Line Signal Detection – Reads and analyses vehicle communication data signals for efficient electronic system diagnostics and fault tracing.
Injector & Relay Testing Support – Simulates ECU output signals to test injectors, relays, and vehicle starting systems with precision.
Advanced Automotive Signal Diagnostics – Detects ignition pulse, crankshaft, camshaft, oxygen sensor, and wheel speed sensor signals for comprehensive troubleshooting.
High-Accuracy Electrical Measurement – Delivers precise voltage, current, resistance, and frequency measurements across a wide testing range.
Automatic Voltage Range Conversion – Supports intelligent auto-ranging for faster and more efficient diagnostics during workshop operations.
Wide Vehicle Compatibility – Suitable for passenger vehicles, trucks, buses, hybrid systems, and modern electric vehicles.
Compact Handheld Workshop Design – Portable and durable construction designed for professional workshop and field-service environments.
Three-Year Warranty Coverage – Includes a comprehensive 3-year manufacturer warranty with replacement support for non-human damage.

Package Includes

AUTOOL DM303 Automotive Diagnostic Multimeter
Protective Carry Case
User Manual
Automotive Circuit Detection Lead
Oscilloscope & Signal Detection Harness
Battery Clip Power Cable
Injector & Relay Test Cable
Ignition Signal Detection Lead
K-Line Signal Lead
CAN+ Signal Lead
CAN− Signal Lead
Ground Wire Lead
Sine Wave Signal Lead
5V Signal Lead
Square Wave Signal Lead
Yellow Jumper Lead Set
Green Jumper Lead Set
Black Jumper Lead Set
Multimeter Test Probes
Probe Terminal Connector
DC Power Connector Cable

Advanced Automotive Electrical Testing Tool

12 Integrated Diagnostic Functions

4-in-1 automotive diagnostic multimeter

Integrated oscilloscope with 500kHz bandwidth

Supports CAN Bus and K-Line diagnostics

Injector, relay, and ignition pulse testing

Accurate voltage, current, and resistance testing

Analog signal output with sine and square wave support

Suitable for petrol, diesel, hybrid, and EV vehicles

Automatic voltage range conversion

ompact handheld workshop design

Backed by a 3-year warranty

The AUTOOL DM303 integrates key testing capabilities, including voltage, current, resistance, oscilloscope analysis, circuit and cranking tests

AUTOOL DM303 automotive diagnostic multimeter

Voltage Measurement Range: DC 0-1000V,AC 0~700V

Current Measurement Range: 0-20A，0~200mA

Resistance Measurement Range: 0-1MΩ

Frequency Measurement: 1Hz~1MHz

Automotive Circuit Drive Current: 0-5A

Injector Drive Signal Output: 500-6000rpm

Working Temperature: 0°C-40°C(32°F-104°F)

AUTOOL DM303 automotive oscilloscope multimeter

Delivery

99% of purchases are dispatched from our Melbourne warehouse within 24 hours of payment. Every parcel is shipped with Australia Post e-Parcel, complete with tracking and signature on delivery.

Need it sooner? Express shipping is also available—check if your postcode is in the Next Day Delivery network.

Returns

Shop with confidence. We offer a 30-day money back guarantee on all orders. If you’ve had a change of mind, simply return the item in re-original condition and we’ll make it right.

Warranty

All AZscanners products are backed by a 12-month warranty (unless otherwise stated). We stand by the quality of our tools and will repair or replace your item if a covered fault arises.

Buying your scan tool should feel easy, safe, and backed by a team you can trust.

That’s why thousands of mechanics, fleets, and car owners across Australia choose AZscanners. Here’s our promise to you:

Trusted Since 2013

We’ve been Australia’s go-to supplier of premium diagnostic scan tools for over a decade. From workshops and mobile mechanics to DIY users, we’ve built our reputation on quality, reliability, and real support.

30-Day Money Back Guarantee

Changed your mind? No problem. You have 30 days to return your item in its original condition for a full refund. It’s our way of making your purchase completely risk-free.

Quality You Can Count On

Every product in our range is hand-picked for performance, compatibility, and durability. Whether you’re after a professional-grade scan tool or an easy solution for home use, we’ve got you covered.

Local Support that Cares

We don’t just sell scan tools — we support them. Our team of technicians is here to answer your questions before and after purchase, so you’re never left on your own.

Fast & Reliable Shipping

99% of orders are shipped within 24 hours (from our Melbourne warehouse) with tracking and signature included. Need it quicker? Express delivery is available.