DC 5–30V Mini LED Digital Voltmeter | 0.28" Panel Voltage Meter

DC 5–30V Mini LED Digital Voltmeter — Compact Voltage Monitoring for Cars, DIY & More

This ultra-compact 0.28-inch DC LED Digital Voltmeter gives you instant, accurate voltage readings across a wide 4V–40V range. Whether you're monitoring your car battery, checking a power supply, or integrating a live voltage display into your DIY electronics project, this panel-mount meter delivers clear, bright readouts in a tiny footprint. Made in Mainland China.

Key Features

• Wide Voltage Range: 2-wire detection from 0–40V; operating range 4V–40V with built-in reverse-polarity protection
• Bright 0.28" LED Display: Three-digit Nixie-tube style LED for easy reading in all lighting conditions
• Fast Refresh Rate: Measurement update every ~200ms for near real-time monitoring
• High Accuracy: ±3% measurement accuracy — reliable for automotive and DIY use
• Low Power Draw: Working current under 20mA — won't drain your battery
• Panel-Mount Ready: Compact 30 × 11.7 × 9.2mm body with a 23 × 10mm installation cutout for flush mounting
• Wide Operating Temperature: -10°C to +65°C — suitable for automotive engine bays, workshops, and outdoor installations
• Plastic Housing: Lightweight and durable for long-term use

Technical Specifications

What's in the Box

• 1 × DC LED Digital Voltmeter

Great For

• Car & motorcycle battery voltage monitoring
• DIY electronics and Arduino projects
• Solar panel and power bank voltage display
• Workshop power supply monitoring
• RC vehicles and hobby battery packs

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For more information on electrical safety when working with vehicle electrical systems, visit the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Voltmeter

Frequently Asked Questions

Q: What voltage range does this digital voltmeter support?

A: This DC LED digital voltmeter operates on a 2-wire system with a working voltage of 4V–40V and a detection range of 0V–40V, making it suitable for 12V car batteries, 24V systems, and a wide variety of DIY power projects.

Q: Does this voltmeter have reverse polarity protection?

A: Yes! The 2-wire configuration includes built-in reverse-polarity protection, helping to safeguard both the meter and your circuit in case of an accidental wiring mistake.

Q: How do I install this panel voltmeter?

A: Simply cut a 23 × 10mm opening in your panel or enclosure. The meter body (30 × 11.7 × 9.2mm) slides in and can be secured in place. Connect the two wires to your DC power source and the display lights up immediately.

Q: Is this voltmeter suitable for use in a car?

A: Absolutely. This meter is designed for automotive applications — it works perfectly for monitoring 12V car or motorcycle battery levels. Its compact size and low current draw (under 20mA) make it ideal for dash-panel or under-bonnet installations.