Multimeter Readings and Signal Waveforms From One Handheld
The DM301 combines a True RMS automotive multimeter with a single-channel oscilloscope for checking ignition, camshaft, crankshaft, wheel-speed and oxygen-sensor signals on low-voltage vehicle circuits. Batteries are not included.
- 500 kHz Single-Channel Scope
- DC 1000 V / AC 700 V
- 20 A Max / 10 A Continuous
- 2.8-Inch Color Display
Key Features
-
Single-Channel Oscilloscope
The 500 kHz figure is analog bandwidth, not sampling rate; the display updates every 1 ms, and one button brings up the waveform automatically.
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Core Electrical Measurements
Voltage, current, resistance, frequency and diode tests, with an audible alert when detected resistance is too low.
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Auto Range and True RMS
Select the mode and connect the test leads; the meter chooses a suitable range.
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Ignition Pulse and Engine Speed
Select the engine cylinder type and ignition mode to help calculate engine speed while observing ignition signals.
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Adjustable Display, 13 Languages
Set screen brightness for the workshop or roadside; the interface includes English, French, Portuguese, Polish, Spanish, Japanese, Russian, Italian, German, Dutch, Korean, Chinese and Traditional Chinese.
More Specifications
| Data lock / clear | Supported |
|---|---|
| Flashlight | Built in |
| Stand | Rear bracket for upright viewing |
DM301 vs DM303
| DM301 | DM303 | |
|---|---|---|
| Basic functions | 6 | 12 |
| Test leads | 2 types | 6 types |
| Injector, relay and starting tests | No | Yes |
| CAN and K/LIN line data reading | No | Yes |
| Circuit drive current | No | 5 A max output / input |
| Injector drive signal output | No | 500–6000 rpm |
| Power options | Dry battery, Type-C, optional lithium battery | Dry battery, Type-C, 12 V rechargeable battery, optional lithium battery |
What’s in the Box
- DM301 auto diagnostic multimeter
- Portable toolbox
- Two types of test leads
- DB-style connector cable
- User manual and retail box
How to Use
- Define the measurementUse the wiring diagram to identify the expected signal, reference point and safe mode.
- Inspect leads and ratingsConfirm the terminal, fuse, lead and probe ratings for the task before connecting.
- Select the modeChoose the function and start on a safe range.
- Probe the circuitConnect to the correct reference and test point without bridging terminals.
- Save and compareRecord the value and operating state, then compare it with the vehicle specification.
Measurement modes, oscilloscope use, settings and software update: DM301 user manual (PDF)
Good to Know
Caution
- Batteries are not included. Use 4 × 1.5 V dry batteries or a compatible lithium battery, purchased separately.
- Do not charge dry batteries through the device; only a compatible rechargeable lithium battery can be charged.
- Do not probe an EV traction circuit or motor power bus without separately rated high-voltage procedures and equipment.
Care
- Use the input limit, terminal, fuse, lead and probe specified for the selected mode.
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