DC Voltmeter Three-Wire 0.28-inch (0.72 cm) Digital Display Module (High-Precision Miniature LED Voltage Panel Meter)
Bring ultra-compact, real-time voltage tracking to your custom electronics enclosures with this premium DC Voltmeter Three-Wire Digital Display Module. Featuring a miniature 0.28-inch (0.72 cm) high-visibility LED screen, this three-wire panel meter delivers continuous, highly accurate voltage readouts without taking up critical space on your chassis layouts.
Monitoring fluctuating voltage rails on active projects manually with a handheld multimeter during runtime is highly impractical. This miniature module provides a permanent, bright visual readout that updates multiple times per second. Because it utilizes a specialized three-wire circuit configuration, it can measure voltage levels all the way down to absolute zero, making it infinitely more versatile than standard two-wire self-powered meters. It serves as the definitive monitoring choice for variable laboratory power supplies, custom battery packs, industrial automation control panels, and multi-channel relay performance diagnostics.
Key Features
Ultra-Compact 0.72 cm LED Screen: Features a bright, crisp three-digit digital display layout that remains highly readable in dark workshop environments or brightly lit showrooms.
Versatile Three-Wire Circuit Layout: Separates the voltmeter's operating power from the voltage line it is testing, allowing the meter to measure ultra-low values from 0V up to 100V DC precisely.
High-Contrast Digital Precision: Programmed with an intelligent moving decimal point framework that automatically switches resolution parameters to maintain maximum readout accuracy.
Integrated Reverse Polarity Protection: Built with internal safety diodes that prevent component damage if the positive and negative power links are accidentally flipped during setup.
Lightweight Molded Mounting Ears: Designed with integrated side mounting tabs, allowing the panel meter to be screwed down flush onto custom plastic faceplates or project cabinets.
Seamless Customization Support: Built on an adaptable manufacturing blueprint. If your specialized commercial product layout requires unique wire harness lengths, custom display colors (such as Red, Blue, or Green), or tailored bezel frames, we can easily modify the module layout to fit your exact specifications.
Technical Specifications
Feature | Specification |
Display Panel Size Dimension | 0.28-inch / 0.72 cm Character Height Profile |
Wiring Configuration Architecture | 3-Wire Interface (Independent Power and Sensing lines) |
Voltage Measuring Range Limit | DC 0.00V to 100V Maximum Tracking Limit |
Voltmeter Operating Power Supply | DC 4.0V to 30V (Required to illuminate the LED grid) |
Measurement Update Refresh Rate | Approximately 300 milliseconds per refresh cycle |
Measurement Accuracy Variance | Plus or minus 1 percent operational tolerance threshold |
Design Flexibility Feature | Custom LED display colors and tailored wire links accepted on demand |
Hardware Wiring Blueprint
The three-wire interface uses a universally color-coded layout to ensure clean, error-free integration into your power grid:
Red Wire (Power Supply +): Connect to a stable direct-current power source between 4V and 30V to turn on the internal LED screen and processor chip.
Black Wire (Common Ground -): Connect to the negative terminal of your power supply and the common reference ground of the system being measured.
Yellow / White Wire (Voltage Sensing Input): Connect straight to the target DC power rail, battery cell, or sensor output that you want to actively measure (Supports 0V to 100V DC).
💡 Two-Wire Conversion Option: If the voltage rail you want to measure is already between 4V and 30V DC, you can tie the Red and Yellow/White wires together and connect them to the positive rail. This converts the module into a simple two-wire, self-powered meter.
Common Applications
Variable Bench Power Supplies: Mount directly into the front panel of custom step-down or step-up voltage regulators to give users a real-time output display.
Lithium Battery Bank Monitoring: Integrate into portable battery enclosures, solar arrays, and electric vehicle chassis to track live discharge states and prevent deep-drain failures.
Industrial Control System Checks: Wire into custom automated control panels to continuously track the input voltage feeding your 5V or 12V industrial relay boards.
Educational Academic Vocational Labs: An exceptional instructional accessory for student engineering kits, introduction to electrical instrumentation, and rapid prototyping breadboards.
Package Includes:
1 x DC Voltmeter Three-Wire 0.28-inch (0.72 cm) Digital Display Module