DC Voltage Current Power Tester – Digital Wattmeter 5.5×2.5mm
DC Voltage Current Power Tester – Digital Wattmeter 5.5×2.5mm
DC Digital Voltage, Current & Power Tester — Wattmeter with Color Display
Get precise, real-time readings of voltage, current, power, capacity, and more with this compact DC Wattmeter and Power Tester. Featuring a vibrant color screen, 360° rotatable display, and a universal DC 5.5×2.5mm interface (also compatible with 2.1mm), it's the ideal measurement tool for electronics hobbyists, makers, and technicians working on DIY projects, bench testing, or device diagnostics.
Made in Mainland China.
Key Features
- Multi-Parameter Measurement: Simultaneously reads voltage, current, power (watts), energy (Wh), capacity (mAh), CPU temperature, elapsed time, and peak voltage/current/power values.
- Color & Monochrome Display: Press and hold the screen rotation button (~3 seconds) to toggle between full-color and black-and-white display modes — optimized for any lighting condition.
- 360° Screen Rotation: Four-direction screen rotation lets you view readings clearly no matter the orientation of your setup.
- Wide Compatibility: Works with computer monitors, routers, network switches, laptops, power tools, and virtually any DC-powered device on the market.
- Dual-Size Male Connector: The 2.5mm tuning-fork male head is also backward-compatible with 2.1mm DC interfaces for maximum versatility.
- High Accuracy & Low Self-Consumption: Uses a precision 0.001Ω sampling resistor for accurate readings; the tester itself draws less than 0.5W — virtually no impact on your measurements.
Technical Specifications
| Working Voltage | DC 4.5 – 50V |
| Working Current | 0 – 6A (short-term peak: 12A) |
| Power Display Range | 0 – 600W |
| Energy Display | 0 – 99,999,999 Wh |
| Capacity Display | 0 – 9,999,999 mAh |
| Display Type | Digital Color Screen (switchable to monochrome) |
| Interface | DC 5.5 × 2.5mm (compatible with 2.1mm) |
| Sampling Resistance | 0.001Ω |
| Self-Consumption | < 0.5W |
| Operating Temperature | 0 – 45°C / 32 – 113°F |
| Dimensions | 58 × 26 × 16mm |
| Battery Included | No |
| Power Source | DC (inline/pass-through) |
What's in the Box?
- 1 × DC Voltage/Current/Power Tester (Wattmeter)
Who Is This For?
This tester is perfect for electronics hobbyists, engineers, and DIY makers who need an accurate, portable, and easy-to-read inline power meter. Whether you're stress-testing a power supply, monitoring the draw of a battery-powered project, or verifying a charger's output, this wattmeter delivers the data you need at a glance.
For more information on electrical safety standards and best practices for DIY electronics work, visit the U.S. Consumer Product Safety Commission (CPSC).
Frequently Asked Questions
Q: What is the maximum voltage and current this DC power tester can measure?
A: The tester measures DC voltage in the range of 4.5V to 50V and current from 0A up to 6A continuous, with a short-term peak capacity of 12A. Power readings go up to 600W.
Q: Is this wattmeter compatible with 2.1mm DC connectors as well as 5.5×2.5mm?
A: Yes! The male connector uses a tuning-fork design with a 2.5mm diameter that is also backward-compatible with standard 2.1mm DC barrel interfaces, making it suitable for a very wide range of DC-powered devices.
Q: Can I rotate the display to read it from different angles?
A: Absolutely. The screen supports full 360° rotation across four directions, so you can orient the tester any way that suits your workbench setup and still read the measurements clearly.
Q: Does the tester come with a battery, or how is it powered?
A: No battery is required. The tester is powered inline by the DC circuit it is measuring — simply connect it between your power source and your device. It consumes less than 0.5W of power itself, ensuring minimal interference with your measurements.