Keszoox
0.28" LED Digital Voltmeter DC 0–100V Panel Gauge | 3-Wire Mini Voltage Meter | Red Blue Green Yellow
0.28" LED Digital Voltmeter DC 0–100V Panel Gauge | 3-Wire Mini Voltage Meter | Red Blue Green Yellow
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0.28" LED Digital Voltmeter — DC 0–100V Panel Gauge, 3-Wire Mini Voltage Meter
A compact, bright LED panel voltmeter for monitoring DC voltage in car dashboards, battery systems, power supplies, and DIY electronics projects. The 0.28" LED digital display provides a clear, high-contrast voltage readout from 0 to 100V DC with ±1% accuracy — readable in both bright sunlight and low-light conditions. The ultra-compact 33 × 11.5 × 9mm body fits a standard 23 × 10mm panel cutout, making it ideal for integration into instrument panels, enclosures, and custom builds. Available in red, blue, green, and yellow LED display colours.
Specifications
| Display | 0.28" LED digital tube (3-digit) |
| Measuring Range | DC 0–100V (3-wire connection) |
| Working Voltage | DC 4–40V (separate power supply) |
| Accuracy | ±1% (>10V) / ±0.2V (<10V) |
| Input Impedance | 50kΩ |
| Working Current | <30mA |
| Refresh Rate | ~100ms |
| Lead Length | 15cm (default) |
| Body Dimensions | 33 × 11.5 × 9mm |
| Panel Cutout | 23 × 10mm |
| Operating Temperature | -10°C to +65°C |
| Display Colours | Red / Blue / Green / Yellow |
3-Wire Connection Guide
| Wire | Function | Connect To |
|---|---|---|
| Red | Power supply positive (VCC) | DC 4–40V power source positive |
| Black | Power supply negative (GND) | Common ground |
| Yellow | Voltage measurement input | Voltage to be measured (0–100V) |
Note: The working voltage (red/black) and the measured voltage (yellow) can be from different sources. The working voltage must be 4–40V DC. Do NOT exceed 40V on the working voltage terminals — this may damage the meter.
Key Features
- ✅ 0–100V DC measurement range — covers 12V, 24V, 36V, 48V, and 72V battery and power systems
- ✅ ±1% accuracy — reliable voltage monitoring for battery state-of-charge and power supply verification
- ✅ Ultra-compact 33 × 11.5 × 9mm — fits in tight panel spaces and custom enclosures
- ✅ 23 × 10mm panel cutout — standard size for easy panel integration
- ✅ 4 display colour options — red, blue, green, yellow to match your panel design or colour-code by function
- ✅ 100ms refresh rate — fast enough to track voltage changes in real time
- ✅ Reverse connection protection — protected against accidental reverse polarity on the working voltage input
- ✅ <30mA working current — minimal power draw, suitable for battery-powered applications
Common Applications
- Car and motorcycle battery voltage monitoring (12V / 24V)
- Electric vehicle (EV) and e-bike battery pack monitoring (36V / 48V / 72V)
- DIY bench power supply voltage display
- Solar charge controller battery voltage monitoring
- LiPo and Li-ion battery pack state-of-charge indicator
- UPS and backup power system voltage monitoring
- CNC machine and 3D printer power supply monitoring
- Custom instrument panel and dashboard builds
Frequently Asked Questions
Q: Can I measure AC voltage with this meter?
A: No. This meter measures DC voltage only (0–100V DC). For AC voltage measurement, a dedicated AC voltmeter is required.
Q: Can the working voltage and measured voltage be the same source?
A: Yes, for voltages between 4V and 40V, you can connect the working voltage (red/black) and measurement input (yellow) to the same source. For voltages above 40V (e.g., 48V, 72V), use a separate 4–40V power source for the working voltage terminals.
Q: How do I mount this in a panel?
A: Cut a 23 × 10mm rectangular hole in your panel. Insert the meter from the front and secure with the included mounting clips or adhesive. Connect the three wires to the appropriate terminals.
Package Contents
- 1× 0.28" LED Digital Voltmeter DC 0–100V (display colour as selected)
