Overview
The 0.36″ 3-Wire Digital Voltmeter is an ultra-compact, highly reliable voltage measurement module enclosed in a protective plastic bezel. Unlike 2-wire voltmeters that stop working below 4V because they draw power from the test source, this 3-wire configuration uses a dedicated power wire. This allows it to read wide-ranging voltages from a completely flat 0V all the way up to 30V DC.
Equipped with a bright, crisp LED display and built-in reverse polarity protection, it is an essential addition for variable bench power supplies, automotive dashboards, solar battery arrays, and custom electronics enclosures.
Key Features
True 0V Reading: Independent power input allows accurate monitoring of low-voltage electronics down to 0V.
Snap-In Panel Shell: The integrated outer frame conceals raw cutout edges, providing a professional, flush-mount finish on plastic or metal project boxes.
Auto-Decimal Precision: Automatically shifts its decimal point (e.g., displaying 9.99V for low voltages and 10.0V for higher inputs) to maximize resolution.
Reverse Polarity Safe: Safe from internal burnout if the measurement leads are accidentally connected backward.
High Refresh Rate: Instantly updates readings to capture voltage drops or spikes in real-time.
Technical Specifications
| Feature | Specification |
| Measurement Range | DC 0.00V to 30.0V |
| Operating Input Voltage | DC 4.5V to 30.0V (Power for the module itself) |
| Display Size & Type | 0.36-inch Seven-Segment LED |
| Measurement Accuracy | ±1% (±1 digit) |
| Current Consumption | Less than 20mA (Ultra-low draw) |
| Refresh Rate | Approx. 300ms / times |
| Operating Temperature | -10°C to +65°C |
| Shell Dimensions | Approx. 35mm x 23mm x 20mm |
| Mounting Cutout Size | Approx. 32mm x 21mm |
Wiring Guide
Connecting this voltmeter to your circuit is straightforward thanks to its color-coded 3-wire system:
Red Wire (VCC): Operating power for the meter itself (Connect to a stable 4.5V – 30V source, like a 5V rail or a battery).
Black Wire (GND): Common Ground (Connect to the system ground shared by both the power supply and the test source).
Yellow / White / Blue Wire (VIN): Voltage Measurement Input (Connect to the specific target point or positive terminal you want to measure, 0V – 30V).
Note: If you want to use it as a standard 2-wire meter to measure its own power source, simply tie the Red and Yellow wires together. Keep in mind that doing this limits your minimum readable measurement voltage to around 4.5V
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