Autool DM400 | Multimeter
Warranty directly via AsTools
Warranty directly via AsTools
We handle warranty cases ourselves, quickly and without involving the manufacturer. Thanks to our own parts inventory and technical expertise, we can usually assist you immediately. Only in exceptional cases do we still send the product to the supplier.
2 years warranty on all products
2 years warranty on all products
All our products come with a 2-year factory warranty. This ensures you long-lasting quality and service.
Easy returns
Easy returns
You can easily request your return through your account. We will send you the return label by email. Return shipping costs are your responsibility.
Professional customer service
Professional customer service
Our experts are ready to help you quickly and professionally, both online and in our physical store. Questions? Feel free to contact us!
The Autool DM400 is a digital True RMS multimeter designed to measure a wide range of electrical parameters. This instrument uses True RMS technology to deliver accurate readings of both sinusoidal and non-sinusoidal AC waveforms. The multimeter features a 6000-count LCD display with backlight for clear visibility.
Functions include AC/DC voltage and current measurement, resistance, capacitance, frequency, duty cycle, and temperature (-20 °C to 1000 °C via the included K-type thermocouple). The DM400 meets safety standards CAT III 1000V and CAT IV 600V — suitable for work on household and distribution networks.
KEY FEATURES
IMPORTANT NOTES
Applications and functionality
The DM400 is ideal for electrical measurements across diverse applications: from household use to professional and industrial environments.
- True RMS measurement: Accurate AC voltage/current independent of waveform.
- Data hold and Max/Min: Freeze readings or capture peak values.
- Temperature measurement: Included K-type thermocouple for °C or °F display.
- Auto/Manual Range: Automatic or manual measurement range selection.
- Backlit Display: Large LCD screen with backlighting.
- Safety Rating: CAT III 1000V & CAT IV 600V.
Measurement Ranges and Functions
- DC Voltage: 0.1 mV to 1000 V
- AC Voltage (True RMS): 0.1 mV to 750 V
- DC Current: 0.1 µA to 20 A
- AC Current (True RMS): 0.1 µA to 20 A
- Resistance: 0.1 Ω to 60 MΩ
- Capacitance: 10 nF to 10,000 µF
- Frequency: 1 Hz to 10 MHz
- Temperature: -20 °C to 1000 °C
- Duty Cycle: 1% to 99%
- Continuity Test: Audible alert for low resistance
- Diode Test: For semiconductor diodes
Package Contents
- 1x Autool DM400 digital multimeter
- 1x Test lead set
- 1x K-type thermocouple
- 1x User manual
Technical Specifications
| Specifications | Description |
|---|---|
| Brand | Autool |
| Model | DM400 |
| Measurement Type | True RMS |
| Display | 6000-count LCD with backlight |
| Range Selection | Auto / Manual |
| Sampling Rate | 3 times per second |
| DC Voltage | 600 mV / 6V / 60V / 600V / 1000V |
| AC Voltage | 600 mV / 6V / 60V / 600V / 750V |
| DC/AC Current | 600 µA / 6000 µA / 60 mA / 600 mA / 20 A |
| Resistance | 600 Ω / 6 kΩ / 60 kΩ / 600 kΩ / 6 MΩ / 60 MΩ |
| Capacitance | 10 nF – 10,000 µF |
| Frequency | 5 Hz – 10 MHz |
| Temperature | -20 °C to 1000 °C |
| Safety Category | CAT III 1000V, CAT IV 600V |
| Power Supply | 2x 1.5V battery (not included) |
| Auto Shutoff | Yes (manually disableable) |
| Operating Environment | 0 – 40 °C, RH <80% |
