DC 2.4-40V Mini LED Digital Voltmeter – Car & Battery Tester
DC 2.4-40V Mini LED Digital Voltmeter – Car & Battery Tester
DC 2.4–40V Mini LED Digital Voltmeter
Keep a precise eye on your DC voltage with this compact 0.28-inch LED digital voltmeter. Designed for cars, motorcycles, battery packs, electric vehicles, and DIY electronics, this mini panel meter delivers fast, accurate readings at a glance — in your choice of four vibrant display colours: Red, Green, Blue, or Yellow. Made in Mainland China.
Key Features
- Wide Measurement Range: Detects DC voltages from 2.4V up to 40V — covers 18650 cells, lithium phone batteries, NiMH packs, car batteries, motorcycle batteries, and more.
- High Accuracy: 3‰ measurement accuracy with a fast refresh rate (≥200ms/reading) for reliable, real-time readings.
- Dual Decimal Precision: Displays two decimal places for voltages below 10V, and one decimal place above 10V — balancing precision and clarity automatically.
- Reverse Polarity Protection: Built-in protection prevents damage if wires are connected incorrectly — no burnt components, no headaches.
- Ultra-Compact 0.28" Display: The tiny footprint fits perfectly in tight spaces — dashboards, battery housings, DIY enclosures, and project boxes.
- Easy 2-Wire Installation: Simple two-wire hookup makes connecting to your vehicle, battery pack, or power supply quick and straightforward.
- Fine-Tuning Function: Calibrate the reading on-the-fly for even greater measurement confidence.
- Low Power Draw: Operates on less than 30mA working current — won't drain your battery.
- Colour Options: Available in Red (range: 2.5–40V), Yellow (2.6–40V), Green (2.6–40V), and Blue (3.2–40V).
Technical Specifications
| Working Voltage | DC 2.4V – 40V (with reverse polarity protection) |
| Detection Voltage | DC 2.4V – 40V |
| Working Current | <30mA |
| Display | 0.28" LED (Red / Green / Blue / Yellow) |
| Measurement Rate | ≥200mS/reading |
| Measurement Accuracy | 3‰ |
| Operating Temperature | -10°C to +65°C |
| Working Humidity | 10%–80% (non-condensing) |
| Package Contents | 1 × Digital Voltmeter with 2 connection wires |
| Country of Origin | Made in Mainland China |
What Can You Measure?
This versatile voltmeter is ideal for monitoring:
- Car and motorcycle batteries
- 18650 lithium cells and mobile phone batteries
- NiMH battery packs
- DC power supply outputs
- Electric vehicle battery systems
- Scientific research and teaching setups
⚠ Important: Do not exceed 40V input — higher voltages may permanently damage the meter. Avoid direct sunlight exposure during use.
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Frequently Asked Questions
Q: What voltage range does this LED digital voltmeter support?
A: This voltmeter supports a DC working and detection voltage range of 2.4V to 40V. Colour-specific lower limits vary slightly: Red starts at 2.5V, Yellow and Green at 2.6V, and Blue at 3.2V. The maximum for all colours is 40V.
Q: Can I use this voltmeter to monitor my car or motorcycle battery?
A: Absolutely. The voltmeter is specifically suited for car batteries (typically 12V) and motorcycle batteries. Simply connect the two wires to your power source and the bright LED display will show your real-time voltage reading.
Q: Does it have reverse polarity protection?
A: Yes — this voltmeter features a built-in reverse polarity protection function. If the wires are accidentally connected in reverse, the unit is protected from damage, giving you peace of mind during installation.
Q: How do I install the voltmeter?
A: Installation is simple. Two pre-attached wires are included — connect the positive wire to your DC positive terminal and the negative wire to the negative terminal. The display powers up immediately from the measured source, so no separate power supply is needed.