4.5-30V DC Two-Wire 0.56" Red / Green / Blue LED Panel Mount Digital Voltmeter
4.5-30V DC Two-Wire 0.56" Red / Green / Blue LED Panel Mount Digital Voltmeter
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📋 Overview
The 4.5-30V DC Two-Wire Panel Mount LED Digital Voltmeter is the easiest way to add a bright, clear voltage readout to any panel, dashboard, or enclosure. With just two wires — red to positive, black to negative — it powers itself from the circuit being measured and displays voltage immediately. No sense wire, no separate power supply, no configuration required.
Choose from Red, Green, or Blue LED display color to complement your panel design. The auto-scaling decimal point ensures you always get the most precise reading for the voltage range in use — two decimal places below 10V for higher resolution, one decimal place above 10V for a clean, easy-to-read display.
Whether you're monitoring a car battery, a solar storage bank, a motorcycle charging system, or a custom electronics project, this compact panel-mount voltmeter delivers reliable, real-time voltage information exactly where you need it.
⭐ Key Features
- Simple two-wire connection — no extra power supply or sense wire needed
- Measures DC voltage from 4.5V to 30V
- Bright 0.56" three-digit LED display — available in Red, Green, or Blue
- Auto-scaling decimal point — XX.XX format below 10V, XXX.X format above 10V
- Accuracy: 1% ±1 digit with minimum resolution of 0.01V (below 10V) or 0.1V (above 10V)
- Fast ~300ms display refresh rate
- Durable ABS housing with panel-mount bezel for a clean, finished look
- Operating temperature: −10°C to 65°C (14°F to 149°F)
📊 Specifications
| Parameter | Value |
|---|---|
| Measuring Range | 4.5V – 30V DC |
| Accuracy | 1% ±1 digit |
| Minimum Resolution | 0.01V (below 10V) / 0.1V (above 10V) |
| Display | 0.56" 3-digit LED |
| Display Color Options | Red, Green, or Blue |
| Refresh Rate | Approx. 300ms |
| Shell Material | ABS plastic |
| Operating Temperature | −10°C to 65°C (14°F to 149°F) |
| Module Size (outside edge of bezel) | Approx. 48 × 29 × 22 mm (1.9 × 1.14 × 0.87 inches) L × W × H |
| Required Panel Cutout | 46 × 26.5 mm (1.81 × 1.04 inches) |
| Pre-attached Wire Length | Approx. 200 mm (7.8 inches) |
| Part Number | EM-METER-0001 |
🔌 Wiring / Connections
Connection couldn't be simpler — just two wires:
| Wire Color | Connect To | Description |
|---|---|---|
| Red | Positive (+) | Battery or power supply positive terminal |
| Black | Negative (−) / Ground | Battery or power supply negative terminal |
The voltmeter draws its operating power directly from the voltage being measured — the moment both wires are connected, the display lights up. No additional wiring steps, no setup menu, no calibration.
⚠️ Important: Do not connect this voltmeter to any voltage source exceeding 30V DC. This meter is not rated for 36V, 48V, or higher voltage systems. Exceeding the rated input voltage may permanently damage the unit.
🎯 Applications
- Car, truck, and motorcycle battery voltage monitoring
- RV and camper house battery systems
- ATV and powersports battery monitoring
- 12V and 24V solar storage battery banks
- DIY electronics project panels and enclosures
- Bench power supply voltage displays
- Golf cart and electric vehicle battery packs (within 30V limit)
- Marine battery monitoring
💡 Tips
Automotive Battery Reference Voltages
Use these reference voltages to quickly assess the state of a standard 12V lead-acid battery:
- 13.7V – 14.7V: Charging normally (engine running or charger connected)
- 12.6V – 12.8V: Fully charged at rest
- 12.0V – 12.4V: Partially discharged — consider recharging
- Below 12.0V: Significantly discharged or potentially failing
Extending the Wires
The pre-attached wires are approximately 200 mm (7.8") long. If a longer run is needed, solder an extension of the same or heavier gauge wire to each lead and insulate the joints with heat-shrink tubing.
Choosing Your Display Color
All three display colors — Red, Green, and Blue — offer the same performance and specifications. Red tends to be the most visible in bright ambient light, Green is a classic instrument-panel color, and Blue offers a modern, high-contrast look in lower-light environments.
⚠️ Important Notes
- DC voltage only: This meter measures DC voltage in the 4.5V to 30V range only. It does not measure AC voltage, current, or resistance.
- 30V maximum — no exceptions: Applying more than 30V DC may permanently damage the unit.
- Low-voltage display dimming: Below approximately 5V, display brightness will reduce noticeably. This is normal — readings remain accurate within the rated range.
- Not weatherproof: The unit has no IP-rated weather or dust protection. For outdoor or harsh-environment installations, mount inside a weatherproof enclosure.
- General-purpose accuracy: Rated accuracy of 1% ±1 digit is well-suited for battery monitoring and voltage checking. For precision lab measurements, a calibrated bench multimeter is recommended.
📄 Documentation & Resources
Sold and supported by Envistia Mall. Ships from the USA. The manufacturer and Envistia LLC (dba Envistia Mall) are not responsible for any damages or losses resulting from the use of this product. Always follow proper electrical safety practices when working with electronic components. Specifications are based on manufacturer data and are subject to change without notice.
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