2-Wire Digital Voltmeter DC 5V–120V | Anti-Reverse EV Meter
2-Wire Digital Voltmeter DC 5V–120V | Anti-Reverse EV Meter
2-Wire Digital Voltmeter – DC 5V to 120V with Anti-Reverse Connection Protection
Monitor your DC voltage with confidence using this compact, high-precision digital voltmeter. Designed for electric vehicles, battery banks, solar systems, and DIY electronics projects, this 2-wire panel meter requires no external power supply — it draws power directly from the circuit being measured. Available in Red, Green, and Blue LED display options, it delivers clear, real-time voltage readings at a glance.
Made in China.
Key Features
- Wide Measurement Range: DC 5V to 120V — suitable for a broad range of DC applications including electric vehicles, battery packs, and power supplies
- No External Power Needed: 2-wire design powers itself directly from the measured circuit — quick and easy installation
- Anti-Reverse Connection Protection: Built-in reverse polarity protection prevents damage if wires are accidentally connected the wrong way
- High Voltage Withstand: Safely withstands up to 132V input without damage (note: voltages above 132V may cause permanent damage)
- High Accuracy: ±1% tolerance for reliable, consistent readings
- Low Start Voltage: Begins operating at just 4V — ideal for low-voltage monitoring
- LED Color Options: Choose Red, Green, or Blue display to match your project or panel design
- Compact Panel-Mount Design: Easy to install into dashboards, enclosures, or custom panels
Technical Specifications
| Measurement Range | DC 5V – 120V |
| Max Input Voltage | DC 132V (do not exceed) |
| Accuracy / Tolerance | ±1% |
| Input Impedance | >100K Ohms |
| Working Current | Red <23mA | Green <18mA | Blue <13mA |
| Lead Length | 20 cm |
| External Dimensions | 48 × 29 × 22 mm |
| Panel Cutout (Hole Size) | 46 × 27 mm |
| Working Temperature | -20°C to +65°C |
| Display Colors Available | Red, Green, Blue |
| Package Includes | 1 × Digital Voltmeter |
Perfect For
- Electric scooters, e-bikes, and electric vehicles
- 12V, 24V, 48V, and 72V battery monitoring
- Solar panel and off-grid power systems
- DIY electronics, Arduino, and maker projects
- Custom control panels and enclosures
Important Notes
- Do not exceed 132V input — voltages above this may permanently damage the meter
- Due to manual measurement, please allow ±1–3mm size tolerance
- Actual LED color may vary slightly from images due to screen display differences
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Frequently Asked Questions
Q: Does this digital voltmeter need a separate power supply to operate?
A: No — this is a 2-wire voltmeter that powers itself directly from the circuit being measured. As long as the measured voltage is within the DC 5V–120V range, no additional power supply is required.
Q: What happens if I connect the wires the wrong way?
A: This voltmeter features built-in anti-reverse connection protection, so accidental reverse polarity will not damage the unit. It's a key safety feature that makes installation worry-free, especially for beginners.
Q: Is this voltmeter suitable for monitoring electric vehicle or e-bike batteries?
A: Yes — this meter is specifically designed to be compatible with most electric vehicles, e-bikes, and scooters. It supports common EV battery voltages including 12V, 24V, 48V, 60V, and 72V systems within its DC 5V–120V range.
Q: What panel cutout size do I need to install this voltmeter?
A: The required panel cutout (hole size) is 46 × 27 mm. The overall body dimensions are 48 × 29 × 22 mm, making it a compact and easy-to-mount panel meter for dashboards and enclosures.